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thu123
2 năm trước
Cho hỗn hợp X gồm Al và Al2O3 tác dụng với dung dịch HCl vừa đủ, thu được dung dịch Y và 6,72 lít khí H2 (đktc). Cho Y tác dụng với dung dịch NaOH, thu được lượng kết tủa lớn nhất là 31,2 gam. Phần trăm khối lượng của Al2O3 trong X là A. 65,385%. B. 34,615%. C. 88,312%. D. 11,688%.
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