Hòa tan 4,86g hỗn hợp gồm 3 kim loại Mg,Al,Fe trong dd H2SO4 loãng dư thu được 4,48l khí (đkc) và dd A. Cho dd tác dụng với NaOH dư, lọc lấy kết tủa đem nung trong không khí đến khối lượng không đổi thu được 3,2g chất rắn.Xác định % khối lượng mỗi kim loại trong hỗn hợp Làm cụ thể cho mk với ạ

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