本课配套习题挑战模式1/4

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单选题
难度系数:

1.

现有16g Fe2O3和CuO的混合物,进行如下实验;把混合物全部加入到100g足量的硫酸溶液中,完全溶解,然后滴加150 g 16 %的氢氧化钠溶液,沉淀质量不再改变。试计算所用硫酸溶液溶质的质量分数为____


A:

28.3%

B:

32.6%

C:

29.4%

D:

42.3%

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