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thu123
2 năm trước
Cho 20 gam hỗ hợp cuso4 và caco3 tác dụng vs dung dịch HCL ( dư ) thì thấy thoát ra 2,24 lít khí ( đktc) . Thành phần phần trăm theo khối lượng của caco3 trong hỗn hợp ban đầu là
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