题目内容

已知:(1)Zn(s)+1/2O2(g)=ZnO(s);H=-348.3 kJ/mol;
(2)2Ag(s)+1/2O2(g)=Ag2O(s);H=-31.0 kJ/mol。则Zn(s)+Ag2O(s)=ZnO(s)+2Ag(s)的H等于
A.-317.3 kJ/molB.-379.3 kJ/mol
C.-332.8 kJ/molD.317.3 kJ/mol
A
将方程式(1)Zn(s)+1/2O2(g)=ZnO(s);H=-348.3 kJ/mol;(2)2Ag(s)+1/2O2(g)=Ag2O(s);H=-31.0 kJ/mol;两方程式叠加,可得Zn(s)+Ag2O(s)=ZnO(s)+2Ag(s);H=-317.3 kJ/mol
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