We can use Hess’s Law to determine the enthalpy change of the overall reaction from the given reactions:
1. N2(g) + 2 O2 ⟶ 2NO2(g) ΔH°298 = 66.4 kJ
2. 2NO(g) + O2 ⟶ 2NO2(g) ΔH°298 = −114.1 kJ
We now need to find a combination of reactions that when added up, gives us the overall reaction.
Calculate the standard molar enthalpy of formation of NO(g) from the following data:
N2(g) + 2O2 ⟶ 2NO2(g) ΔH°298 = 66.4 kJ
2NO(g) + O2 ⟶ 2NO2(g) ΔH°298 = −114.1 kJ
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