HEL Use Hess's law and the following equations to calculate ΔH for the reaction SO2(g) + NO2(g) SO3(g) + NO(g). (Show your work.)

• SO3(g) SO2(g) + O2(g)

ΔH = –98.4 kJ/mol
• N2(g) + O2(g) NO(g)

ΔH = 90.3 kJ/mol
• NO2(g) N2(g) + O2(g)

ΔH = –33.1 kJ/mol