Calculate the Energy Required for the Gas Phase Process Represented $\rarr$

Multiple Choice

Calculate the energy required for the gas phase process represented by Na(g) + Br(g) $\rarr$ Na⁺(g) + Br^- (g) .
Given: Ionization energy (Na) = 496 kJ/mol
Electron affinity (Br) = 324 kJ/mol
Electron affinity (Na) = 53 kJ/mol

A) 152 kJ/mol
B) 162 kJ/mol
C) 172 kJ/mol
D) 182 kJ/mol
E) None of the above