Use Hess's law and the following equations to calculate triangle H for the reaction SO2 (g) + NO2 (g) arrow SO3 (g) + NO (g). SO3(g) arrow SO2(g) + 1/2O2(g) traingleH=-98.4kJ/mol
1/2N2(g) + 1/2O2(g) arrow NO(g) triangleH=90.3 kJ/mol
NO2(g) arrow 1/2N2(g) + O2 (g) triangleH=-33.1 kJ/mol