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mocphi1234
2 năm trước
Cho a gam hh A Fe2O3, Fe304, Cu vào dd HCl dư thấy có 0,7mol Axit phản ứng, còn lại 0,35a gam chất rắn không tan. Mặt khác, khử hoàn toàn a gam hh A bằng H2 dư thu được 34,4 gam chất rắn. Tính %khối lượng Cu
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