题目

将钠、钾分别投入相同质量的稀H2SO4中,反应结束后,两种溶液的质量仍相等而金属均无剩余,则投入的钠、钾的质量比为(  ) A.∶                                                   B.∶ C.∶                                                    D.∶ 答案:D 解析:分别投23 g Na、39 g K,都释放出1 g H2。现设溶液均增重m g,则 Na          ~             H2            Δm 23                         1                  22  m g                                    m g K            ~            H2                 Δm 39                         1                   38  m g                                    m g
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