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  • You need another \nonumber in the second iteration; the last equation isn't numbered in the original. Commented Jun 10, 2019 at 2:25
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    Wouldn't that be a nice opportunity to advertize siunitx for kJ? Commented Jun 10, 2019 at 2:34
  • Thank you, @barbarabeeton Commented Jun 10, 2019 at 3:19
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    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. \mathrm{f}; c. It would be nice to fix typesetting for ethane (proper indices and upright font), e.g. with \ce{C2H6}. I also agree with @marmot that using siunitx would make the answer look more professional. Commented Jun 10, 2019 at 4:00