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Calculate the enthalpy of the reaction: 2NO(g) + O2(g) --> 2NO2(g)
given the following reactions and enthalpies of formation:
1/2 N2(g) + O2(g) --> NO2(g), delta H *A = 33.2 kJ
1/2 N2(g) + 1/2O2(g) --> NO(g), delta H *B= 90.2 kJ
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