题目内容

已知:(1)Zn(s)+
1
2
O2(g)═ZnO(s),△H=-348.3kJ/mol(2)2Ag(s)+
1
2
O2(g)═Ag2O(s),△H=-31.0kJ/mol
则Zn与Ag2O反应生成ZnO和Ag的热化学方程式为(  )
A.Zn(s)+Ag2O(s)═ZnO(s)+2Ag(s),△H=317.3kJ/mol
B.Zn+Ag2O═ZnO+2Ag,△H=317.3kJ/mol
C.Zn(s)+Ag2O(s)═ZnO(s)+2Ag(s),△H=-317.3kJ/mol
D.2Zn(s)+2Ag2O(s)═2ZnO(s)+4Ag(s),△H=-317.3kJ
已知:(1)Zn(s)+
1
2
O2(g)═ZnO(s),△H=-348.3kJ/mol,
(2)2Ag(s)+
1
2
O2(g)═Ag2O(s),△H=-31.0kJ/mol,
根据盖斯定律,(1)-(2)得Zn(s)+Ag2O(s)═ZnO(s)+2Ag(s),△H=-317.3kJ/mol.
故选:C.
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