题目内容
已知:(1)Zn(s)+1/2O2(g)=ZnO(s) △H=-348.3kJ·mol-1 ,
(2)2Ag(s)+1/2O2(g)=Ag2O(s) △H=-31.0kJ·mol-1,
则Zn(s)+Ag2O(s)=ZnO(s)+2Ag(s)的△H等于
(2)2Ag(s)+1/2O2(g)=Ag2O(s) △H=-31.0kJ·mol-1,
则Zn(s)+Ag2O(s)=ZnO(s)+2Ag(s)的△H等于
A.-317.3kJ·mol-1 | B.-379.3kJ·mol-1 | C.-332.8kJ·mol-1 | D.+317.3kJ·mol-1 |
A
由热化学方程式:(1)Zn(s)+1/2O2(g)=ZnO(s) △H=-348.3kJ·mol-1 ,(2)2Ag(s)+1/2O2(g)=Ag2O(s) △H=-31.0kJ·mol-1,可知,将两热化学方程式叠加,得Zn(s)+Ag2O(s)=ZnO(s)+2Ag(s)△H=-317.3kJ·mol-1
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