Calculate the enthalpy of the reaction

2NO (g) + O2 (g) →2NO2 (g)

given the following reactions and enthalpies of formation:

12N2 (g) + O2 (g) →NO2 (g), ΔfH∘A=33.2 kJ mol-1

12N2 (g) + 12O2 (g) →NO (g), ΔfH∘B=90.2 kJ mol-1

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