Given the standard enthalpy changes for the following two reactions: (1) N2(g) + O2(g) → 2NO(g) (2) N2(g) +202 (9) → N2O4(9) AH° 181.8 kJ AH° = 9.2 kJ What is the standard enthalpy change for the following reaction? (3) 2NO(g) + O2(g) → N2O4 (9) ΔΗ° =? Standard enthalpy change = 8.836 kj

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