For Two Ions with Charges Q₁ and Q₂ Separated by Distance

For two ions with charges q₁ and q₂ separated by distance r, the potential energy canbe calculated from Coulomb's law: E = Calculate the energy released when 1 mole NaCl is formed if the constant k = 1.11 × 10^-10 C²/J·m, the charge Na⁺ = +1 e, and the charge on Cl^- is -1 e, e = 1.602 × 10^-19 C, and

A) +308 kJ/mol
B) +8.20 kJ/mol
C) -297 kJ/mol
D) -494 kJ/mol
E) -371 kJ/mol