The First Ionization Energy of Sodium Is 495 $\rarr$ Na⁺(g) + E^- Is Therefore
A) 495

The first ionization energy of sodium is 495.9 kJ/mol. The energy change for the reaction Na(s) $\rarr$ Na⁺(g) + e^- is therefore

A) 495.9 kJ/mol.
B) less than 495.9 kJ/mol.
C) greater than 495.9 kJ/mol.
D) is equal to the electron affinity of sodium.
E) is equal to the second ionization energy of sodium.