Calculate the standard heat of formation...

Calculate the standard heat of formation of `C_(10)H_(8)` (naphthalene) if standard heat of combustion of nephathalene is `-123.0 kcal` at 298K and standard heats of formation of `CO_(2)(g) and H_(2)O(l)` are -94.0 kcal and -68.4 kcal respectively.

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17.4 kcal

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