(1) N2(g) + O2(g)2NO(g)...... ΔH° = 181.8 kJ (2) N2(g) + 2O2(g)2NO2(g)......ΔH° = 66.4 kJ what is the standard enthalpy change for the reaction: (3) 2NO(g) + O2(g)2NO2(g)......ΔH° = ? kJ

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