The heat liberated when 1.89 { g} of benzoic acid is burnt in a bomb calorimeter at 25^\circ{C} increases the temperature of 18.94 { kg} of water by 0.632^\circ{C}. If the specific heat of water at 25^\circ{C} is 0.998 {cal} \/(g-{ }^\circ{C}), then find the heat of combustion of benzoic acid.

Correct Answer is : 3240 kJ mol−1