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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), ΔH∘A = 33.2 kJ
12N2(g) + 1/2 O2(g) → NO(g), ΔH∘B = 90.2 kJ
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