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AT 300K, the standard enthalpies of form...

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

Text Solution

Verified by Experts

The correct Answer is:
8
`DeltaG^(@) = DeltaH^(@) - tDeltaS^(@)`
`21.6 = DeltaH_(H-H) - 300 (2 xx S_(H)^(@) - S_(H_(2))^(@))`
`DeltaH_(H-H) = 33.6 KJ "mole"^(-1) =8Kcal "mole"^(-1)`
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