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cho 9g một kim loại R có hóa trị không đổi vào dung dịch HCl 1mol, dư sau khi kim loại phản ứng hết người ta thu được 11,2 lít khí đo ở dktc. Xác định kim loại R và tính thể tích dung dịch HCl cần phản ứng
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