Determine the enthalpy of the reaction: S (s) + 3/2 O2 (g)  SO3 (g), given the following reactions. SO2 (g)  S(s) + O2 (g) ΔH = +296.0 kJ 2 SO3 (g)  2 SO2 (g) + O2 (g) ΔH = +198.2 kJ