Enthalpy changes for the following reactions can be determined experimentally: 

Use these values to determine the enthalpy change for the formation of NO(g) from the elements (an enthalpy change that cannot be measured directly because the reaction is reactant-favored). 

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N₂(g) + 3 H₂(g) → 2 NH3(g) AH = -91.8 kJ/mol-rxn 4 NH3(g) + 5 O₂(g) → 4 NO(g) + 6 H₂O(g) AH-906.2 kJ/mol-rxn H₂(g) + ¹/2O2(g) → H₂O(g) A,H° = -241.8 kJ/mol-rxn