For which one of the following reactions is the value of H°rxn equal to H°f for the product?

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To determine which one of the following reactions has the value of H°rxn equal to H°f for the product, we need to compare the enthalpy change of the reaction (H°rxn) with the standard enthalpy of formation of the product (H°f).

The enthalpy change of a reaction (H°rxn) is given by the difference between the sum of the standard enthalpies of formation of the reactants and the sum of the standard enthalpies of formation of the products. In a balanced chemical equation, the coefficients represent the number of moles of each substance involved in the reaction.

The standard enthalpy of formation (H°f) of a substance is defined as the enthalpy change when one mole of the substance is formed from its constituent elements in their standard states, with all reactants and products in their standard states as well.

Therefore, the reaction where the value of H°rxn is equal to H°f for the product is the reaction where the sum of the standard enthalpies of formation of the reactants is equal to the sum of the standard enthalpies of formation of the products.

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