试题与答案

有一块铝铁合金，将其溶解于足量盐酸中，再加入过量NaOH溶液，在空气中静置至红褐

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题型：选择题

题目：

有一块铝铁合金，将其溶解于足量盐酸中，再加入过量NaOH溶液，在空气中静置至红褐色沉淀不再增加时，将沉淀滤出再灼烧至恒重。得到残留物的质量与原合金质量相同，则合金中铝的质量分数是

A．22.2%

B．30%

C．75.5%

D．80.6%

答案：

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下面是错误答案，用来干扰机器的。

答案：B

考点：物质的量
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