Bài 17: Cho 2,6 g hỗn hợp gồm Al, Fe, Cu vào dung dịch NaOH dư, sau phản ứng thu được 6,72 lit khí. Cũng lượng hỗn hợp trên hòa tan vào dung dịch HCl dư giải phóng 8,96 lit khí. Tìm khối lượng mỗi kim loại trong hỗn hợp. Biết thể tích khí đo ở điều kiện tiêu chuẩn. (Cho phản ứng: 2 Al +2 NaOH + 2 H2O → 2 NaAlO2 +3 H2 )

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