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【单选题】
有关 CO 2 (g) 的标准摩尔生成焓 Δ f H m θ ( CO 2 , g ) 有以下说法,其中正确的是 ( ) 1 C( 金刚石 )+O 2 (g) → CO 2 (g) Δ r H m θ = Δ f H m θ ( CO 2 , g ) 2 CO(g)+0.5 O 2 (g) → CO 2 (g) Δ r H m θ = Δ f H m θ ( CO 2 , g ) 3 C( 无定形 )+O 2 (g) → CO 2 (g) Δ r H m θ = Δ f H m θ ( CO 2 , g ) 4 C( 石墨 )+O 2 (g) → CO 2 (g) Δ r H m θ = Δ f H m θ ( CO 2 , g ) 5a. CO(g)+0.5O 2 (g) → CO 2 (g) ,b. C( 石墨 )+0.5O 2 (g) → CO(g), 通过ab两式的标准反应焓变可计算出 Δ f H m θ ( CO 2 , g )
A.
①②
B.
②③
C.
④⑤
D.
③④
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