2 g Cu2S和CuS的混合物在酸性溶液中用400 mL 0.075 mol·L-1 KMnO4溶液处理

2 g Cu2SCuS的混合物在酸性溶液中用400 mL 0.075 mol·L1 KMnO4溶液处理发生反应如下5Cu2S44H= 10Cu25SO2↑+8Mn222H2O

          5CuS28H= 5Cu25SO2↑+6Mn214H2O

反应后煮沸溶液赶尽SO2剩余的KMnO4恰好与350 mL 0.1 mol·L1(NH4)2Fe(SO4)2溶液完全反应。

 1配平KMnO4(NH4)2Fe(SO4)2反应的离子方程式

____________Fe2______H=______Mn2______Fe3______H2O

 2KMnO4溶液与混合物反应后剩余KMnO4的物质的量为________mol

 3混合物中Cu2S的质量分数为________

答案

11  5  8  1  5  4       20.007       340% 

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