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Cho 23g hỗn hợp Al, Mg, Fe vào cốc đựng dd H2SO4 . Sau khi kết thúc phản ứng thấy xuất hiện 8,96l khí H2 và chất rắn B. Cho tiếp dd HCl đến dư vào cốc thì thấy thoát ra thêm 11,2l khí. Đun nóng cốc thu được m gam muối. Tính m
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