Can coal (carbon) be "burned" in a hydrogen atmosphere? I know it would not match the definition of "combustion".

But is the reaction $$\ce{C +2H2 ->CH4}$$ exothermic?

(I'm fairly convinced this is a duplicate, but I didn't find any question like that.)

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    $\begingroup$ To find the enthalpy change associated with the reaction you can find heats of formation and use Hess' law. The heats of formation you need can probably be easily found online or in a textbook. $\endgroup$ Dec 1, 2019 at 14:09
  • $\begingroup$ @orthocresol Thank you, but I need some more help. I have no textbook, I'm out of school for some decades. A link would be useful. $\endgroup$ Dec 1, 2019 at 14:13
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    $\begingroup$ Google is your friend! en.wikipedia.org/wiki/Methane_(data_page) $\endgroup$
    – Waylander
    Dec 1, 2019 at 15:48
  • $\begingroup$ Please mention the state of reactants so that there is no confusion while calculating the enthalpy change. I suppose that you asked it out of curiosity, in that case yes it is exothermic. $\endgroup$ Dec 1, 2019 at 18:10
  • $\begingroup$ @PRITIPRIYADASBEHERA I did not know that curiosity contributed to making a reaction exothermic... $\endgroup$
    – Karsten
    Dec 2, 2019 at 16:26

1 Answer 1


The formation reaction of CH4 is exothermic. The heat of formation is : -75 kJ/mol

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    $\begingroup$ In my opinion, citing a reputable source for the data would make it a better answer. Also, probably a brief note on terminology (something along the lines why "combustion" isn't the best term here) wouldn't hurt either, I think. $\endgroup$
    – andselisk
    Dec 1, 2019 at 18:16

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