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Cho 11 g hỗn hợp Al,Fe vào dung dịch HCL 7,3%(lấy dư 20% so với lượng cần thiết) thu được 8,96l khí đktc và dung dịch X .Cho X tác dụng với 1 mol Naoh thu được a(g) kết tủa .tính a
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