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【单选题】
反应 Na 2 O(s) + I 2 (g) = 2NaI(s) +1/2O 2 (g) 的 ∆ r H m Ɵ 为A.
2 ∆ f H m Ɵ (NaI, s) – ∆ f H m Ɵ (Na 2 O, s)
B.
∆ f H m Ɵ (NaI, s) – ∆ f H m Ɵ (Na 2 O, s) – ∆ f H m Ɵ (I 2 , g)
C.
2 ∆ f H m Ɵ (NaI, s) – ∆ f H m Ɵ (Na 2 O, s) – ∆ f H m Ɵ (I 2 , g)
D.
∆ f H m Ɵ (NaI, s) – ∆ f H m Ɵ (Na 2 O, s)
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