2N2(g) + 502(g) → 2N2O5(g) AH = H2(g) + ½ O2(g) → H2O(1) ΔΗ rxn -285.8 kJ N2O5(g) + H2O(1) → 2HNO3(1) ΔΗ rxn -76.6 kJ N2(g) + 302(g) + H2(g) → 2HNO3(1) AH rxn = -348.2 kJ

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