Hoà tan 1,42 (g) hỗn hợp gồm Mg, Al, Cu bằng dung dịch HCl dư thu được dung dịch A, khí B và chất rắn D. Cho A tác dụng với dung dịch NaOH dư và lọc lấy kết tủa nung ở nhiệt độ cao đến khối lượng không đổi thu được 0,4 (g) chất rắn E. Nung chất rắn D trong không khí đến khối lượng không đổi thu được 0,8 (g) chất rắn F. Tính khối lượng của mỗi kim loại trong hỗn hợp ban đầu.

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