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Given the standard enthalpy changes for the following two reactions:

(1)N2(g) + 2O2(g)N2O4(g)…… Î”H° = 9.2 kJ

(2)2N2O(g)2N2(g) + O2(g)……ΔH° = -164.2 kJ

what is the standard enthalpy change for the reaction:

(3)2N2O(g) + 3O2(g)2N2O4(g)……ΔH° = ?

 kJ

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