Question

What is ΔHreaction for the decomposition of 1 mole of sodium chlorate (H^0f values NaClO3(s) =
-85.7kcal/mol, NaCl(s) = -98.2kcal/mol, O2 (g) = 0kcal/mol
A) -183.9 kcal
B) -91.9 kcal
C) +45.3 kcal
D) +22.5 kcal
E) -12.5 kcal