The reactants in the reaction 2NO(g) + O 2 (g) 2NO 2 (g) are initially at

Question:

The reactants in the reaction 2NO(g) + O₂(g) → 2NO₂(g) are initially at 298 K. Why is the reaction enthalpy the same if (a) the reaction is constantly kept at 298 K or (b) if the reaction temperature is not controlled and the heat flow to the surroundings is measured only after the temperature of the products is returned to 298 K?

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