题目

已知：(1)Zn(s)＋1/2O2(g) = ZnO(s)；ΔH =－348.3 kJ/mol；(2)2Ag(s)＋1/2O2(g) = Ag2O(s)；ΔH =－31.0 kJ/mol，则Zn(s)＋Ag2O(s) = ZnO(s)＋2Ag(s)的ΔH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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