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NO(g) + O3(g) --> NO2(g) + (O2)g ΔH = -198.9 kJ/mol O3(g) --> 3/2 O2(g) ΔH = -142.3 kJ/mol O2(g) --> 2O(g) ΔH = +495 kJ/mol Use the thermochemical reactions given above to determine the enthalpy change for 2NO(g) + 4O(g) --> 2NO2(g) + O2(g)