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Phvietthoan
1 năm trước
Cho 23,7g hỗn hợp gồm Fe, Mg, Cu vào dung dịch H2SO4 đặc nguội, dư thì thu được 10,1 lít khí SO2 (đktc). Phần không tan cho tác dụng với dung dịch HCl dư thu được 3,7 lít khí (đktc). Tính phần trăm khối lượng hỗn hợp ban đầu.
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