試題詳解

5. For which one of the following reactions is the value of ∆Ho rxn equal to ∆Ho f for the product?
(A)2Ca_(s) + O_2(g)→ 2CaO_(s)
(B)C₂H_2(g) + H_2(g)→ C₂H_4(g)
(C) 2C(graphite) + O_2(g)→ 2CO_(g)
(D)3Mg_(s) + N_2(g)→ Mg₃N_2(s)
(E) None of these