Cho 0,56g hỗn hợp A gồm Mg và Cu tác dụng với dung dịch HCl dư.Sau phản ứng thu được 224ml khí H2 đktc.Viết phương trình phản ứng và xác định thành phần % của từng kim loại trong hỗn hợp ban đầu

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