How do I reduce spacing between 2 segments of a line in a multiple alignment environment?Multiple alignmentLeft aligning equations without align characterAlignment in an alignat environmentMultiple alignment in align environmentAlignment and line breaking in alignment environmentMultiple = alignmentAlignment within enumerate environment and mhchemHow to fix multiple alignmentCentering between alignment charactersUnsuitable multiple alignment

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How do I reduce spacing between 2 segments of a line in a multiple alignment environment?


Multiple alignmentLeft aligning equations without align characterAlignment in an alignat environmentMultiple alignment in align environmentAlignment and line breaking in alignment environmentMultiple = alignmentAlignment within enumerate environment and mhchemHow to fix multiple alignmentCentering between alignment charactersUnsuitable multiple alignment






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








3















Currently, there is a large gap between the 2 segments of a line, causing its index to be pushed to the following line. How can I prevent this?




documentclassarticle

usepackageamsmath
usepackagemhchem
usepackageamssymb

begindocument
Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
beginalignat2
ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
nonumber & &&= -84 kJ \
nonumber &&therefore Delta H_f(C_2H6)^0 &= -84kJ
endalignat2
enddocument


enter image description here










share|improve this question
























  • you could just add in preamble usepackagefullpage

    – KJO
    Jun 10 at 1:52






  • 1





    Other typography issues: Write phyical units (kJ) upright and separated by a space. H_f(C_2H6)^0 is wrong on several levels: subscript f should be upright, subscript formula should be upright (use ce), superscript is not a 0, but circ. IUPAC recommendation (Green Book) is to write Delta_mathrmfH^circ (ceC2H6). Lastly, are you sure about your calculation? Unit of standard enthalpy is not kJ.

    – mhchem
    Jun 10 at 5:48


















3















Currently, there is a large gap between the 2 segments of a line, causing its index to be pushed to the following line. How can I prevent this?




documentclassarticle

usepackageamsmath
usepackagemhchem
usepackageamssymb

begindocument
Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
beginalignat2
ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
nonumber & &&= -84 kJ \
nonumber &&therefore Delta H_f(C_2H6)^0 &= -84kJ
endalignat2
enddocument


enter image description here










share|improve this question
























  • you could just add in preamble usepackagefullpage

    – KJO
    Jun 10 at 1:52






  • 1





    Other typography issues: Write phyical units (kJ) upright and separated by a space. H_f(C_2H6)^0 is wrong on several levels: subscript f should be upright, subscript formula should be upright (use ce), superscript is not a 0, but circ. IUPAC recommendation (Green Book) is to write Delta_mathrmfH^circ (ceC2H6). Lastly, are you sure about your calculation? Unit of standard enthalpy is not kJ.

    – mhchem
    Jun 10 at 5:48














3












3








3








Currently, there is a large gap between the 2 segments of a line, causing its index to be pushed to the following line. How can I prevent this?




documentclassarticle

usepackageamsmath
usepackagemhchem
usepackageamssymb

begindocument
Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
beginalignat2
ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
nonumber & &&= -84 kJ \
nonumber &&therefore Delta H_f(C_2H6)^0 &= -84kJ
endalignat2
enddocument


enter image description here










share|improve this question
















Currently, there is a large gap between the 2 segments of a line, causing its index to be pushed to the following line. How can I prevent this?




documentclassarticle

usepackageamsmath
usepackagemhchem
usepackageamssymb

begindocument
Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
beginalignat2
ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
nonumber & &&= -84 kJ \
nonumber &&therefore Delta H_f(C_2H6)^0 &= -84kJ
endalignat2
enddocument


enter image description here







align indexing alignment mhchem alignat






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Jun 10 at 1:52









Steven B. Segletes

167k9 gold badges210 silver badges428 bronze badges




167k9 gold badges210 silver badges428 bronze badges










asked Jun 10 at 1:20









David LuDavid Lu

161 bronze badge




161 bronze badge












  • you could just add in preamble usepackagefullpage

    – KJO
    Jun 10 at 1:52






  • 1





    Other typography issues: Write phyical units (kJ) upright and separated by a space. H_f(C_2H6)^0 is wrong on several levels: subscript f should be upright, subscript formula should be upright (use ce), superscript is not a 0, but circ. IUPAC recommendation (Green Book) is to write Delta_mathrmfH^circ (ceC2H6). Lastly, are you sure about your calculation? Unit of standard enthalpy is not kJ.

    – mhchem
    Jun 10 at 5:48


















  • you could just add in preamble usepackagefullpage

    – KJO
    Jun 10 at 1:52






  • 1





    Other typography issues: Write phyical units (kJ) upright and separated by a space. H_f(C_2H6)^0 is wrong on several levels: subscript f should be upright, subscript formula should be upright (use ce), superscript is not a 0, but circ. IUPAC recommendation (Green Book) is to write Delta_mathrmfH^circ (ceC2H6). Lastly, are you sure about your calculation? Unit of standard enthalpy is not kJ.

    – mhchem
    Jun 10 at 5:48

















you could just add in preamble usepackagefullpage

– KJO
Jun 10 at 1:52





you could just add in preamble usepackagefullpage

– KJO
Jun 10 at 1:52




1




1





Other typography issues: Write phyical units (kJ) upright and separated by a space. H_f(C_2H6)^0 is wrong on several levels: subscript f should be upright, subscript formula should be upright (use ce), superscript is not a 0, but circ. IUPAC recommendation (Green Book) is to write Delta_mathrmfH^circ (ceC2H6). Lastly, are you sure about your calculation? Unit of standard enthalpy is not kJ.

– mhchem
Jun 10 at 5:48






Other typography issues: Write phyical units (kJ) upright and separated by a space. H_f(C_2H6)^0 is wrong on several levels: subscript f should be upright, subscript formula should be upright (use ce), superscript is not a 0, but circ. IUPAC recommendation (Green Book) is to write Delta_mathrmfH^circ (ceC2H6). Lastly, are you sure about your calculation? Unit of standard enthalpy is not kJ.

– mhchem
Jun 10 at 5:48











4 Answers
4






active

oldest

votes


















4














Here, I use mathllap on the last line. But as you can see, there is still one remaining margin issue that you need to consider.



Also, the endalignat does not take an argument.



documentclassarticle
usepackage[pass,showframe]geometry
usepackagemathtools
usepackagemhchem
usepackageamssymb

begindocument
Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
beginalignat2
ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
nonumber & &&= -84 kJ \
nonumber &&mathllaptherefore Delta H_f(C_2H6)^0 &= -84kJ
endalignat
enddocument


enter image description here



You could try to break up the remaining long line, but there may be other approaches, too...



I also made your kJ units upright, though, as marmot points out, the siunitx package is tailor made for applying units to quantities.



documentclassarticle
usepackage[pass,showframe]geometry
usepackagemathtools
usepackagemhchem
usepackageamssymb

begindocument
Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
beginalignat2
ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 mathrm,kJ\
ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 mathrm,kJ\
ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 mathrm,kJ\
nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858\nonumber&&&phantom=+1560\
nonumber & &&= -84 mathrm,kJ \
nonumber &&mathllaptherefore Delta H_f(C_2H6)^0 &= -84mathrm,kJ
endalignat
enddocument


enter image description here






share|improve this answer

























  • You need another nonumber in the second iteration; the last equation isn't numbered in the original.

    – barbara beeton
    Jun 10 at 2:25






  • 2





    Wouldn't that be a nice opportunity to advertize siunitx for kJ?

    – marmot
    Jun 10 at 2:34











  • Thank you, @barbarabeeton

    – Steven B. Segletes
    Jun 10 at 3:19






  • 2





    Regarding H_f(C_2H6)^0 part: a. According to IUPAC, standard state should be denoted with either a superscript circle (^circ) or a superscript Plimsoll symbol (^⦵ + xelatex compiler), not a zero; b. subscript f ("formation") should be upright, e.g. mathrmf; c. It would be nice to fix typesetting for ethane (proper indices and upright font), e.g. with ceC2H6. I also agree with @marmot that using siunitx would make the answer look more professional.

    – andselisk
    Jun 10 at 4:00



















2














Use of fullpage style (must be the shortest CTAN manual that nobody reads :-)

you could just add in preamble



usepackagefullpage



enter image description here



documentclassarticle
usepackagefullpage
usepackageamsmath
usepackagemhchem
usepackageamssymb

begindocument
Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
beginalignat2
ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
nonumber & &&= -84 kJ \
nonumber &&therefore Delta H_f(C_2H6)^0 &= -84kJ
endalignat
enddocument





share|improve this answer
































    0














    This does steal a bit of the left margin, if that is not acceptable I think you would need to wrap the final term over two lines.



    enter image description here



    documentclassarticle

    usepackageamsmath
    usepackagemhchem
    usepackageamssymb

    begindocument
    Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g)%Underfull hbox (badness 10000) \
    beginalignat2
    ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
    ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
    ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
    nonumberhspace*-250ptce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &Delta H &= -786-858+1560\
    nonumber & &&= -84 kJ \
    nonumber &therefore& Delta H_f(C_2H6)^0 &= -84kJ
    endalignat2
    enddocument


    Note I moved the therefore back a bit so it's not so cramped (and so the display is a bit narrower and requires less overhang). Also never use \ before a display.






    share|improve this answer























    • Hi, can you elaborate a little bit on what you meant when you said "never use \ before a display"? Was there an extra \ in my document where there shouldn't have been one?

      – David Lu
      Jun 12 at 5:00






    • 1





      @DavidLu yes latex must have screamed badness 10000 at you:-) (that is it's maximum level in its assessment of the poor quality of the output), the \ before beginalignat on the first line after C2H6(g)} is wrong.

      – David Carlisle
      Jun 12 at 13:05



















    0














    If you have space constraints, you can use more lines:



    documentclassarticle

    usepackageamsmath
    usepackageamssymb
    usepackage[version=4]mhchem
    usepackagesiunitx

    newcommandmove[2]hspace#1makebox[0pt][r]$displaystyle#2$

    begindocument

    Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g), in units~sikilojoule
    beginalign
    ce2C(s) + 2O2(g) &-> 2CO2(g) \
    nonumber &move6emDelta H = -786 \
    ce3H2(g) + 3/2 O2(g) &-> H2O(l) \
    nonumber & move6emDelta H = -858 \
    ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) \
    nonumber & move6emDelta H = 1560 \
    ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) \
    nonumber & move6emDelta H = -786-858+1560\
    nonumber & move6em = -84 \
    nonumber & move6emtherefore Delta H_f(ceC_2H6)^0 = SI-84kilojoule
    endalign

    enddocument


    enter image description here






    share|improve this answer

























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      4 Answers
      4






      active

      oldest

      votes








      4 Answers
      4






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      4














      Here, I use mathllap on the last line. But as you can see, there is still one remaining margin issue that you need to consider.



      Also, the endalignat does not take an argument.



      documentclassarticle
      usepackage[pass,showframe]geometry
      usepackagemathtools
      usepackagemhchem
      usepackageamssymb

      begindocument
      Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
      beginalignat2
      ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
      ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
      ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
      nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
      nonumber & &&= -84 kJ \
      nonumber &&mathllaptherefore Delta H_f(C_2H6)^0 &= -84kJ
      endalignat
      enddocument


      enter image description here



      You could try to break up the remaining long line, but there may be other approaches, too...



      I also made your kJ units upright, though, as marmot points out, the siunitx package is tailor made for applying units to quantities.



      documentclassarticle
      usepackage[pass,showframe]geometry
      usepackagemathtools
      usepackagemhchem
      usepackageamssymb

      begindocument
      Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
      beginalignat2
      ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 mathrm,kJ\
      ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 mathrm,kJ\
      ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 mathrm,kJ\
      nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858\nonumber&&&phantom=+1560\
      nonumber & &&= -84 mathrm,kJ \
      nonumber &&mathllaptherefore Delta H_f(C_2H6)^0 &= -84mathrm,kJ
      endalignat
      enddocument


      enter image description here






      share|improve this answer

























      • You need another nonumber in the second iteration; the last equation isn't numbered in the original.

        – barbara beeton
        Jun 10 at 2:25






      • 2





        Wouldn't that be a nice opportunity to advertize siunitx for kJ?

        – marmot
        Jun 10 at 2:34











      • Thank you, @barbarabeeton

        – Steven B. Segletes
        Jun 10 at 3:19






      • 2





        Regarding H_f(C_2H6)^0 part: a. According to IUPAC, standard state should be denoted with either a superscript circle (^circ) or a superscript Plimsoll symbol (^⦵ + xelatex compiler), not a zero; b. subscript f ("formation") should be upright, e.g. mathrmf; c. It would be nice to fix typesetting for ethane (proper indices and upright font), e.g. with ceC2H6. I also agree with @marmot that using siunitx would make the answer look more professional.

        – andselisk
        Jun 10 at 4:00
















      4














      Here, I use mathllap on the last line. But as you can see, there is still one remaining margin issue that you need to consider.



      Also, the endalignat does not take an argument.



      documentclassarticle
      usepackage[pass,showframe]geometry
      usepackagemathtools
      usepackagemhchem
      usepackageamssymb

      begindocument
      Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
      beginalignat2
      ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
      ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
      ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
      nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
      nonumber & &&= -84 kJ \
      nonumber &&mathllaptherefore Delta H_f(C_2H6)^0 &= -84kJ
      endalignat
      enddocument


      enter image description here



      You could try to break up the remaining long line, but there may be other approaches, too...



      I also made your kJ units upright, though, as marmot points out, the siunitx package is tailor made for applying units to quantities.



      documentclassarticle
      usepackage[pass,showframe]geometry
      usepackagemathtools
      usepackagemhchem
      usepackageamssymb

      begindocument
      Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
      beginalignat2
      ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 mathrm,kJ\
      ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 mathrm,kJ\
      ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 mathrm,kJ\
      nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858\nonumber&&&phantom=+1560\
      nonumber & &&= -84 mathrm,kJ \
      nonumber &&mathllaptherefore Delta H_f(C_2H6)^0 &= -84mathrm,kJ
      endalignat
      enddocument


      enter image description here






      share|improve this answer

























      • You need another nonumber in the second iteration; the last equation isn't numbered in the original.

        – barbara beeton
        Jun 10 at 2:25






      • 2





        Wouldn't that be a nice opportunity to advertize siunitx for kJ?

        – marmot
        Jun 10 at 2:34











      • Thank you, @barbarabeeton

        – Steven B. Segletes
        Jun 10 at 3:19






      • 2





        Regarding H_f(C_2H6)^0 part: a. According to IUPAC, standard state should be denoted with either a superscript circle (^circ) or a superscript Plimsoll symbol (^⦵ + xelatex compiler), not a zero; b. subscript f ("formation") should be upright, e.g. mathrmf; c. It would be nice to fix typesetting for ethane (proper indices and upright font), e.g. with ceC2H6. I also agree with @marmot that using siunitx would make the answer look more professional.

        – andselisk
        Jun 10 at 4:00














      4












      4








      4







      Here, I use mathllap on the last line. But as you can see, there is still one remaining margin issue that you need to consider.



      Also, the endalignat does not take an argument.



      documentclassarticle
      usepackage[pass,showframe]geometry
      usepackagemathtools
      usepackagemhchem
      usepackageamssymb

      begindocument
      Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
      beginalignat2
      ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
      ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
      ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
      nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
      nonumber & &&= -84 kJ \
      nonumber &&mathllaptherefore Delta H_f(C_2H6)^0 &= -84kJ
      endalignat
      enddocument


      enter image description here



      You could try to break up the remaining long line, but there may be other approaches, too...



      I also made your kJ units upright, though, as marmot points out, the siunitx package is tailor made for applying units to quantities.



      documentclassarticle
      usepackage[pass,showframe]geometry
      usepackagemathtools
      usepackagemhchem
      usepackageamssymb

      begindocument
      Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
      beginalignat2
      ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 mathrm,kJ\
      ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 mathrm,kJ\
      ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 mathrm,kJ\
      nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858\nonumber&&&phantom=+1560\
      nonumber & &&= -84 mathrm,kJ \
      nonumber &&mathllaptherefore Delta H_f(C_2H6)^0 &= -84mathrm,kJ
      endalignat
      enddocument


      enter image description here






      share|improve this answer















      Here, I use mathllap on the last line. But as you can see, there is still one remaining margin issue that you need to consider.



      Also, the endalignat does not take an argument.



      documentclassarticle
      usepackage[pass,showframe]geometry
      usepackagemathtools
      usepackagemhchem
      usepackageamssymb

      begindocument
      Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
      beginalignat2
      ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
      ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
      ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
      nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
      nonumber & &&= -84 kJ \
      nonumber &&mathllaptherefore Delta H_f(C_2H6)^0 &= -84kJ
      endalignat
      enddocument


      enter image description here



      You could try to break up the remaining long line, but there may be other approaches, too...



      I also made your kJ units upright, though, as marmot points out, the siunitx package is tailor made for applying units to quantities.



      documentclassarticle
      usepackage[pass,showframe]geometry
      usepackagemathtools
      usepackagemhchem
      usepackageamssymb

      begindocument
      Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
      beginalignat2
      ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 mathrm,kJ\
      ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 mathrm,kJ\
      ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 mathrm,kJ\
      nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858\nonumber&&&phantom=+1560\
      nonumber & &&= -84 mathrm,kJ \
      nonumber &&mathllaptherefore Delta H_f(C_2H6)^0 &= -84mathrm,kJ
      endalignat
      enddocument


      enter image description here







      share|improve this answer














      share|improve this answer



      share|improve this answer








      edited Jun 10 at 3:19

























      answered Jun 10 at 1:50









      Steven B. SegletesSteven B. Segletes

      167k9 gold badges210 silver badges428 bronze badges




      167k9 gold badges210 silver badges428 bronze badges












      • You need another nonumber in the second iteration; the last equation isn't numbered in the original.

        – barbara beeton
        Jun 10 at 2:25






      • 2





        Wouldn't that be a nice opportunity to advertize siunitx for kJ?

        – marmot
        Jun 10 at 2:34











      • Thank you, @barbarabeeton

        – Steven B. Segletes
        Jun 10 at 3:19






      • 2





        Regarding H_f(C_2H6)^0 part: a. According to IUPAC, standard state should be denoted with either a superscript circle (^circ) or a superscript Plimsoll symbol (^⦵ + xelatex compiler), not a zero; b. subscript f ("formation") should be upright, e.g. mathrmf; c. It would be nice to fix typesetting for ethane (proper indices and upright font), e.g. with ceC2H6. I also agree with @marmot that using siunitx would make the answer look more professional.

        – andselisk
        Jun 10 at 4:00


















      • You need another nonumber in the second iteration; the last equation isn't numbered in the original.

        – barbara beeton
        Jun 10 at 2:25






      • 2





        Wouldn't that be a nice opportunity to advertize siunitx for kJ?

        – marmot
        Jun 10 at 2:34











      • Thank you, @barbarabeeton

        – Steven B. Segletes
        Jun 10 at 3:19






      • 2





        Regarding H_f(C_2H6)^0 part: a. According to IUPAC, standard state should be denoted with either a superscript circle (^circ) or a superscript Plimsoll symbol (^⦵ + xelatex compiler), not a zero; b. subscript f ("formation") should be upright, e.g. mathrmf; c. It would be nice to fix typesetting for ethane (proper indices and upright font), e.g. with ceC2H6. I also agree with @marmot that using siunitx would make the answer look more professional.

        – andselisk
        Jun 10 at 4:00

















      You need another nonumber in the second iteration; the last equation isn't numbered in the original.

      – barbara beeton
      Jun 10 at 2:25





      You need another nonumber in the second iteration; the last equation isn't numbered in the original.

      – barbara beeton
      Jun 10 at 2:25




      2




      2





      Wouldn't that be a nice opportunity to advertize siunitx for kJ?

      – marmot
      Jun 10 at 2:34





      Wouldn't that be a nice opportunity to advertize siunitx for kJ?

      – marmot
      Jun 10 at 2:34













      Thank you, @barbarabeeton

      – Steven B. Segletes
      Jun 10 at 3:19





      Thank you, @barbarabeeton

      – Steven B. Segletes
      Jun 10 at 3:19




      2




      2





      Regarding H_f(C_2H6)^0 part: a. According to IUPAC, standard state should be denoted with either a superscript circle (^circ) or a superscript Plimsoll symbol (^⦵ + xelatex compiler), not a zero; b. subscript f ("formation") should be upright, e.g. mathrmf; c. It would be nice to fix typesetting for ethane (proper indices and upright font), e.g. with ceC2H6. I also agree with @marmot that using siunitx would make the answer look more professional.

      – andselisk
      Jun 10 at 4:00






      Regarding H_f(C_2H6)^0 part: a. According to IUPAC, standard state should be denoted with either a superscript circle (^circ) or a superscript Plimsoll symbol (^⦵ + xelatex compiler), not a zero; b. subscript f ("formation") should be upright, e.g. mathrmf; c. It would be nice to fix typesetting for ethane (proper indices and upright font), e.g. with ceC2H6. I also agree with @marmot that using siunitx would make the answer look more professional.

      – andselisk
      Jun 10 at 4:00














      2














      Use of fullpage style (must be the shortest CTAN manual that nobody reads :-)

      you could just add in preamble



      usepackagefullpage



      enter image description here



      documentclassarticle
      usepackagefullpage
      usepackageamsmath
      usepackagemhchem
      usepackageamssymb

      begindocument
      Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
      beginalignat2
      ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
      ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
      ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
      nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
      nonumber & &&= -84 kJ \
      nonumber &&therefore Delta H_f(C_2H6)^0 &= -84kJ
      endalignat
      enddocument





      share|improve this answer





























        2














        Use of fullpage style (must be the shortest CTAN manual that nobody reads :-)

        you could just add in preamble



        usepackagefullpage



        enter image description here



        documentclassarticle
        usepackagefullpage
        usepackageamsmath
        usepackagemhchem
        usepackageamssymb

        begindocument
        Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
        beginalignat2
        ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
        ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
        ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
        nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
        nonumber & &&= -84 kJ \
        nonumber &&therefore Delta H_f(C_2H6)^0 &= -84kJ
        endalignat
        enddocument





        share|improve this answer



























          2












          2








          2







          Use of fullpage style (must be the shortest CTAN manual that nobody reads :-)

          you could just add in preamble



          usepackagefullpage



          enter image description here



          documentclassarticle
          usepackagefullpage
          usepackageamsmath
          usepackagemhchem
          usepackageamssymb

          begindocument
          Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
          beginalignat2
          ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
          ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
          ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
          nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
          nonumber & &&= -84 kJ \
          nonumber &&therefore Delta H_f(C_2H6)^0 &= -84kJ
          endalignat
          enddocument





          share|improve this answer















          Use of fullpage style (must be the shortest CTAN manual that nobody reads :-)

          you could just add in preamble



          usepackagefullpage



          enter image description here



          documentclassarticle
          usepackagefullpage
          usepackageamsmath
          usepackagemhchem
          usepackageamssymb

          begindocument
          Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g) \
          beginalignat2
          ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
          ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
          ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
          nonumber ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &indent Delta H &= -786-858+1560\
          nonumber & &&= -84 kJ \
          nonumber &&therefore Delta H_f(C_2H6)^0 &= -84kJ
          endalignat
          enddocument






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Jun 10 at 2:19

























          answered Jun 10 at 2:10









          KJOKJO

          5,9051 gold badge4 silver badges28 bronze badges




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              0














              This does steal a bit of the left margin, if that is not acceptable I think you would need to wrap the final term over two lines.



              enter image description here



              documentclassarticle

              usepackageamsmath
              usepackagemhchem
              usepackageamssymb

              begindocument
              Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g)%Underfull hbox (badness 10000) \
              beginalignat2
              ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
              ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
              ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
              nonumberhspace*-250ptce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &Delta H &= -786-858+1560\
              nonumber & &&= -84 kJ \
              nonumber &therefore& Delta H_f(C_2H6)^0 &= -84kJ
              endalignat2
              enddocument


              Note I moved the therefore back a bit so it's not so cramped (and so the display is a bit narrower and requires less overhang). Also never use \ before a display.






              share|improve this answer























              • Hi, can you elaborate a little bit on what you meant when you said "never use \ before a display"? Was there an extra \ in my document where there shouldn't have been one?

                – David Lu
                Jun 12 at 5:00






              • 1





                @DavidLu yes latex must have screamed badness 10000 at you:-) (that is it's maximum level in its assessment of the poor quality of the output), the \ before beginalignat on the first line after C2H6(g)} is wrong.

                – David Carlisle
                Jun 12 at 13:05
















              0














              This does steal a bit of the left margin, if that is not acceptable I think you would need to wrap the final term over two lines.



              enter image description here



              documentclassarticle

              usepackageamsmath
              usepackagemhchem
              usepackageamssymb

              begindocument
              Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g)%Underfull hbox (badness 10000) \
              beginalignat2
              ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
              ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
              ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
              nonumberhspace*-250ptce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &Delta H &= -786-858+1560\
              nonumber & &&= -84 kJ \
              nonumber &therefore& Delta H_f(C_2H6)^0 &= -84kJ
              endalignat2
              enddocument


              Note I moved the therefore back a bit so it's not so cramped (and so the display is a bit narrower and requires less overhang). Also never use \ before a display.






              share|improve this answer























              • Hi, can you elaborate a little bit on what you meant when you said "never use \ before a display"? Was there an extra \ in my document where there shouldn't have been one?

                – David Lu
                Jun 12 at 5:00






              • 1





                @DavidLu yes latex must have screamed badness 10000 at you:-) (that is it's maximum level in its assessment of the poor quality of the output), the \ before beginalignat on the first line after C2H6(g)} is wrong.

                – David Carlisle
                Jun 12 at 13:05














              0












              0








              0







              This does steal a bit of the left margin, if that is not acceptable I think you would need to wrap the final term over two lines.



              enter image description here



              documentclassarticle

              usepackageamsmath
              usepackagemhchem
              usepackageamssymb

              begindocument
              Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g)%Underfull hbox (badness 10000) \
              beginalignat2
              ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
              ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
              ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
              nonumberhspace*-250ptce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &Delta H &= -786-858+1560\
              nonumber & &&= -84 kJ \
              nonumber &therefore& Delta H_f(C_2H6)^0 &= -84kJ
              endalignat2
              enddocument


              Note I moved the therefore back a bit so it's not so cramped (and so the display is a bit narrower and requires less overhang). Also never use \ before a display.






              share|improve this answer













              This does steal a bit of the left margin, if that is not acceptable I think you would need to wrap the final term over two lines.



              enter image description here



              documentclassarticle

              usepackageamsmath
              usepackagemhchem
              usepackageamssymb

              begindocument
              Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g)%Underfull hbox (badness 10000) \
              beginalignat2
              ce2C(s) + 2O2(g) &-> 2CO2(g) &Delta H &= -786 kJ\
              ce3H2(g) + 3/2 O2(g) &-> H2O(l) &Delta H &= -858 kJ\
              ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) &Delta H &= 1560 kJ\
              nonumberhspace*-250ptce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) &Delta H &= -786-858+1560\
              nonumber & &&= -84 kJ \
              nonumber &therefore& Delta H_f(C_2H6)^0 &= -84kJ
              endalignat2
              enddocument


              Note I moved the therefore back a bit so it's not so cramped (and so the display is a bit narrower and requires less overhang). Also never use \ before a display.







              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered Jun 10 at 15:46









              David CarlisleDavid Carlisle

              512k43 gold badges1163 silver badges1925 bronze badges




              512k43 gold badges1163 silver badges1925 bronze badges












              • Hi, can you elaborate a little bit on what you meant when you said "never use \ before a display"? Was there an extra \ in my document where there shouldn't have been one?

                – David Lu
                Jun 12 at 5:00






              • 1





                @DavidLu yes latex must have screamed badness 10000 at you:-) (that is it's maximum level in its assessment of the poor quality of the output), the \ before beginalignat on the first line after C2H6(g)} is wrong.

                – David Carlisle
                Jun 12 at 13:05


















              • Hi, can you elaborate a little bit on what you meant when you said "never use \ before a display"? Was there an extra \ in my document where there shouldn't have been one?

                – David Lu
                Jun 12 at 5:00






              • 1





                @DavidLu yes latex must have screamed badness 10000 at you:-) (that is it's maximum level in its assessment of the poor quality of the output), the \ before beginalignat on the first line after C2H6(g)} is wrong.

                – David Carlisle
                Jun 12 at 13:05

















              Hi, can you elaborate a little bit on what you meant when you said "never use \ before a display"? Was there an extra \ in my document where there shouldn't have been one?

              – David Lu
              Jun 12 at 5:00





              Hi, can you elaborate a little bit on what you meant when you said "never use \ before a display"? Was there an extra \ in my document where there shouldn't have been one?

              – David Lu
              Jun 12 at 5:00




              1




              1





              @DavidLu yes latex must have screamed badness 10000 at you:-) (that is it's maximum level in its assessment of the poor quality of the output), the \ before beginalignat on the first line after C2H6(g)} is wrong.

              – David Carlisle
              Jun 12 at 13:05






              @DavidLu yes latex must have screamed badness 10000 at you:-) (that is it's maximum level in its assessment of the poor quality of the output), the \ before beginalignat on the first line after C2H6(g)} is wrong.

              – David Carlisle
              Jun 12 at 13:05












              0














              If you have space constraints, you can use more lines:



              documentclassarticle

              usepackageamsmath
              usepackageamssymb
              usepackage[version=4]mhchem
              usepackagesiunitx

              newcommandmove[2]hspace#1makebox[0pt][r]$displaystyle#2$

              begindocument

              Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g), in units~sikilojoule
              beginalign
              ce2C(s) + 2O2(g) &-> 2CO2(g) \
              nonumber &move6emDelta H = -786 \
              ce3H2(g) + 3/2 O2(g) &-> H2O(l) \
              nonumber & move6emDelta H = -858 \
              ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) \
              nonumber & move6emDelta H = 1560 \
              ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) \
              nonumber & move6emDelta H = -786-858+1560\
              nonumber & move6em = -84 \
              nonumber & move6emtherefore Delta H_f(ceC_2H6)^0 = SI-84kilojoule
              endalign

              enddocument


              enter image description here






              share|improve this answer



























                0














                If you have space constraints, you can use more lines:



                documentclassarticle

                usepackageamsmath
                usepackageamssymb
                usepackage[version=4]mhchem
                usepackagesiunitx

                newcommandmove[2]hspace#1makebox[0pt][r]$displaystyle#2$

                begindocument

                Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g), in units~sikilojoule
                beginalign
                ce2C(s) + 2O2(g) &-> 2CO2(g) \
                nonumber &move6emDelta H = -786 \
                ce3H2(g) + 3/2 O2(g) &-> H2O(l) \
                nonumber & move6emDelta H = -858 \
                ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) \
                nonumber & move6emDelta H = 1560 \
                ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) \
                nonumber & move6emDelta H = -786-858+1560\
                nonumber & move6em = -84 \
                nonumber & move6emtherefore Delta H_f(ceC_2H6)^0 = SI-84kilojoule
                endalign

                enddocument


                enter image description here






                share|improve this answer

























                  0












                  0








                  0







                  If you have space constraints, you can use more lines:



                  documentclassarticle

                  usepackageamsmath
                  usepackageamssymb
                  usepackage[version=4]mhchem
                  usepackagesiunitx

                  newcommandmove[2]hspace#1makebox[0pt][r]$displaystyle#2$

                  begindocument

                  Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g), in units~sikilojoule
                  beginalign
                  ce2C(s) + 2O2(g) &-> 2CO2(g) \
                  nonumber &move6emDelta H = -786 \
                  ce3H2(g) + 3/2 O2(g) &-> H2O(l) \
                  nonumber & move6emDelta H = -858 \
                  ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) \
                  nonumber & move6emDelta H = 1560 \
                  ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) \
                  nonumber & move6emDelta H = -786-858+1560\
                  nonumber & move6em = -84 \
                  nonumber & move6emtherefore Delta H_f(ceC_2H6)^0 = SI-84kilojoule
                  endalign

                  enddocument


                  enter image description here






                  share|improve this answer













                  If you have space constraints, you can use more lines:



                  documentclassarticle

                  usepackageamsmath
                  usepackageamssymb
                  usepackage[version=4]mhchem
                  usepackagesiunitx

                  newcommandmove[2]hspace#1makebox[0pt][r]$displaystyle#2$

                  begindocument

                  Overall formation of ethane thingy: ce2 C(s) + 3 H2(g) -> C2H6(g), in units~sikilojoule
                  beginalign
                  ce2C(s) + 2O2(g) &-> 2CO2(g) \
                  nonumber &move6emDelta H = -786 \
                  ce3H2(g) + 3/2 O2(g) &-> H2O(l) \
                  nonumber & move6emDelta H = -858 \
                  ce2 CO2(g) + 3 H2O(l) &-> C2H6(g) + 7/2 O2 (g) \
                  nonumber & move6emDelta H = 1560 \
                  ce2 C(s) + 3 H2(g) + 7/2 O2(g) &-> C2H6(g) + 7/2 O2(g) \
                  nonumber & move6emDelta H = -786-858+1560\
                  nonumber & move6em = -84 \
                  nonumber & move6emtherefore Delta H_f(ceC_2H6)^0 = SI-84kilojoule
                  endalign

                  enddocument


                  enter image description here







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                  answered Jun 10 at 16:29









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