When 1.350 g of benzoic acid (C₇H₆O₂) burns completely in excess O₂ gas at constant volume and 298 K, it releases 35.61 kJ of energy.

2 C₇H₆O₂ +15 O₂ →14 CO₂ + 6 H₂O

(b) What is the molar energy of combustion of benzoic acid?