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Anhthu710
2 năm trước
Cho 20g hh gồm Cu và Mg tác dụng với dd HCl loãng,đủ thu được 5,6lít khí ở đktc,%khối lượng của Cu trong hh đầu là A.30% B.70% C.60% D.40% Giải chi tiết giúp mk ạ.
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