Given the standard enthalpy changes for the following two reactions:

(1)N2(g) + O2(g)2NO(g)…… Î”H° = 181.8 kJ

(2)N2(g) + 2O2(g)N2O4(g)……ΔH° = 9.2 kJ

what is the standard enthalpy change for the reaction:

(3)2NO(g) + O2(g)N2O4(g)……ΔH° = ?


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