题目

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/mol                   B．－379.3 kJ/mol C．－332.8 kJ/mol                   D．+317.3 kJ/mol 答案：A

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