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Calculate the heat of combustion of 1 mo...

Calculate the heat of combustion of 1 mole of `C_(2)H_(4)(g)` to form `CO_(2)(g)` and `H_(2)O(g)` at 398K and 1 atmosphere, given that the heats of formation of `CO_(2)(g),H_(2)O(g) and C_(2)H_(4)(g)` are `-94.1,-57.8 and +12.5kcal" "mol^(-1)` respectively.

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`-316.3` kcal
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