下列反应的ΔrGθ等于产物的ΔfGθA:N2(g)＋3H2(g)＝2NH3(g) B:MnO(s)＋1/2O2(g)＝MnO2(s) C:H2(g)＋1/2O2(g)＝H2O (l) D:1/2H2(g)＋1/2I2(g)＝HI(g) 答案: H2(g)＋1/2O2(g)＝H2O (l)