At $300\: K$, the standard enthalpies of formation of $C_6H_5COOH(s), CO_2(g)\: and\: H_2O(l)\: are\: -408, -393\: and\: -286 \: kJ/mol$ respectively. Calculate the heat of combustion of benzoic acid at constant volume and at constant pressure. $(R=8.31\: J/Kmol)$

Question

$\begin {array} {1 1} (A)\;-3202.25 \: kJ/mol & \quad (B)\;3202.25 \: kJ/mol \\ (C)\;-3209.25\: kJ/mol & \quad (D)\;3209.25\: kJ/mol \end {array}$