For which one of the following reactions is the value of ΔH°_rxn equal to ΔH°_f for the product? A)2C (s, graphite) + 2H₂ (g) → C₂H₄ (g) B)N₂ (g) + O₂ (g) → 2NO (g) C)2H₂ (g) + O₂ (g) → 2H₂O (l) D)2H₂ (g) + O₂ (g) → 2H₂O (g) E)H₂O (l) + 1/2 O₂ (g) → H₂O₂ (l)

Question

Quizplus · Accepted Answer

The value of ΔH°_rxn is equal to the value of ΔH°_f for the product only for reactions that have only one product. In option A, the product is C₂H₄ (g), which is the only product in the reaction. Therefore, the value of ΔH°_rxn is equal to the value of ΔH°_f for the product.

For Which One of the Following Reactions Is the Value