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Regarding Hess's Law is ΔHf of Ethane the same as the Enthalpy of Combustion

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    • Thread Starter

    I have a revision question asking me to draw the energy cycle for the formation of Ethane C2H6 and use given values.

    Would this just be a combustion energy cycle

    So you have. 2C + 3H2 ------> C2H6
    \ /
    \ /
    v v
    2CO2 + 3H2O

    Therefore ΔHf + ΔH1 = ΔH2 + ΔH3

    Therefore ΔHf = ΔH2 + ΔH3 - ΔH1

    Or would it be different?

    There seems to be information missing from your post, but your algebra at the end is correct. Not that I know what it applies to.
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