题目

以惰性电极电解CuSO4溶液，若阳极上产生气体的物质的量为0.010 0 mol，则阴极上析出Cu的质量为                                                                                               (　　) A．0.64 g                                        B．1.28 g C．2.56 g                                        D．5.12 g 答案：B

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