Given the Following Information, Calculate ΔH°(in Kcal Mol^-1) For

Given the following information, calculate ΔH°(in kcal mol^-1) for:
NaI(s) → Na+(g) + I-(g)

A) 816 kcal mol^-1
B) 823 kcal mol^-1
C) 562 kcal mol^-1
D) 746 kcal mol^-1
E) 798 kcal mol^-1