【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%