为了测定某铜银合金的成分,将30克合金溶于80ml ,13.5mol/L的浓硝酸

 为了测定某铜银合金的成分,将30克合金溶于80ml ,13.5mol/L的浓硝酸中,待合金完全溶解后,收集到6.72L气体(标准状况下),并测得溶液中c(H+)=1mol/L,设反应后溶液体积仍为80ml。计算:

1)被还原的硝酸的物质的量是               

2)合金中银的质量分数是              

答案

10.3 mol  4     236%  4

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