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

A) 2H2(g) + O2(g) → 2 H2O(g)

B) N2(g) + O2(g) → 2 NO(g)

C) H2O(l) + 1/2 O2(g) → H2O2(l)

D) 2 C(s, graphite) + 2 H2(g) → C2H4(g)

E) 2 H2(g) + O2(g) → 2H2O(l)

thanks for the help!

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