Chemistry

Which gives off more heat when burning CH4 or CH3OH and why?

I think it would be CH3OH, but I am not sure and cannot find any information on the reason why. Does any one have any suggestion? Am I even right to begin with? Thanks.

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asked by Sara
  1. I would say CH3OH too because it has oxygen and oxygen produces heat i think but I'm no chemist
    brad

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    posted by brad
  2. Do you know how to calculate the heat of the reaction; i.e., delta Hrxn?
    Write the equations.
    CH4 + 2O2 ==> CO2 + 2H2O
    CH3OH + 2O2 ==> CO2 + 2H2O
    Now look up in your text the delta Hof for each of the products and reactants (elements are zero)
    delta Hrxn = delta Hproducts - delta Hreactants
    Let me know if you need additional assistance but explain what you don't understand.

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