單項選擇題

下列反應(yīng)中ΔrHΘm等于產(chǎn)物ΔfHΘm的是()

A.CO2(g)+CaO(s)===CaCO3(s)
B.1/2H2(g)+1/2I2(g)===HI(g)
C.H2(g)+Cl2(g)===2HCl(g)
D.H2(g)+1/2O2(g)===H2O(g)

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