The Standard Enthalpy of Reaction $\Delta$ H° at 25 C° NH₃(g)+ HCl(g)

The standard enthalpy of reaction, $\Delta$ H° at 25 C° NH₃(g) + HCl(g) $\rarr$ NH₄Cl(s) is -175.9 kJ mol^-1. Determine the value of $\Delta$ E°_rxn for this reaction.

A) -164.8 kJ mol^-1
B) -170.9 kJ mol^-1
C) -173.4 kJ mol^-1
D) -180.9 kJ mol^-1
E) +5134 kJ mol^-1