Nitric Acid Is Formed by the Gas-Phase Hydrolysis of N₂O₅ $\rarr$

Nitric acid is formed by the gas-phase hydrolysis of N₂O₅. For the reaction N₂O₅ + H₂O $\rarr$ 2HNO₃, E_a(forward) = 15 kJ/mol and E_a(reverse) = 51 kJ/mol. Calculate $\Delta$ H_rxn.

A) -36 kJ/mol
B) -56 kJ/mol
C) -76 kJ/mol
D) -96 kJ/mol
E) None of the above