At 300 K, the standard enthalpies of for...

At 300 K, the standard enthalpies of formation of `C_(6)H_(5)COOH(s),CO_(2)(g) and H_(2)O(l)` are -408,-393 and -286kJ `mol^(-1)` respectively. Calculate the heat of combustion of benzoic acid at (i) constant pressure and (ii) constant volume. `(R=8.31J" "mol^(-1)K^(-1))`

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(i) `DeltaH=-320kJ" "mol^(-1)`
(ii) `DeltaU=-3199.75kJ" "mol^(-1)`

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