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The heats of formation of C(6)H(6)(l),H(...

The heats of formation of `C_(6)H_(6)(l),H_(2)O(l) and CO_(2)(g)` are 11.70,-68.4 and -94.0 kcal respectively. Calculate the heat of combustion of benzene (l).

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Verified by Experts

The correct Answer is:
`-780.9kcal`
`C_(6)H_(6)(l)+(15)/(2)O_(2)(g)to6CO_(2)(g)+3H_(2)O(l),DeltaH=?`
`DeltaH=6xxDeltaH_(f(CO_(2)))+3xxDeltaH_(f(H_(2)O))-DeltaH_(f(C_(6)H_(6)))`
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