Given that: S(s) + O2(g) --> SO2(g); ΔH = -148.4 kJ/mol 2 SO3(g) --> 2 SO2(g) + O2(g); ΔH = +197.8 kJ/mol Determine the enthalpy change of the reaction: 2 S(s) + 3 O2(g) --> 2 SO3(g)