Question

把m g鐵鋁合金粉末溶于足量鹽酸中，加入過量NaOH溶液，過濾出沉淀，經(jīng)洗滌、干燥、灼燒，得到紅棕色粉末的質(zhì)量仍為m g，則原合金中鐵的質(zhì)量分?jǐn)?shù)為(    )

A.70%                                       B.52.4%

C.47.6%                                    D.30%

Answer 1

A

解析：鐵鋁合金中鐵的質(zhì)量分?jǐn)?shù)等于最后得到的紅棕色粉末Fe₂O₃中鐵的質(zhì)量分?jǐn)?shù)。