(3分)向某铁粉样品中,加入溶质质量分数为10%的硫酸铜溶液160 g,恰好完全反应,样品中杂质不溶于水也不与硫酸铜反应

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  • 【解】设:样品中铁的质量为x,生成铜的质量为y,生成硫酸亚铁的质量为z[

    Fe  +  CuSO 4 =  FeSO 4+ Cu

    56      160       152    64

    x    160g×10%    z      y

    x = 5.6g    y = 6.4g    z = 15.2g    ···························1 分

    (1)a =" 5.6g" +(6.8g – 6.4g)= 6g       ····························1 分

    (2)5.6g + 160g – 6.4g + 40.8g = 200g

    15.2g / 200g  × 100%  = 7.6%      ···························1 分

    答:(1)a的数值为6.

    (2)所得溶液中溶质的质量分数为7.6%

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