题目内容

【题目】已知:①C(s)+ O2(g)═CO(g);△H=﹣110.5kJmol1
②C(s)+O2(g)═CO2(g);△H=﹣393.51kJmol1
则反应C(s)+CO2(g)═2CO(g)的△H为(
A.﹣283.01 kJmol1
B.+172.51 kJmol1
C.+283.01 kJmol1
D.﹣172.51 kJmol1

【答案】B
【解析】解:已知:C (s)+ O2(g)=CO(g)△H=﹣110.50KJ/mol ①
C (s)+O2(g)=CO2(g)△H=﹣393.51KJ/mol
根据盖斯定律,将2①﹣②可得:C (s)+CO2(g)=2CO(g)△H=(﹣110.50KJ/mol )×2﹣(﹣393.51KJ/mol )=+172.51 kJmol1
故选B.

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