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Hòa tan 19,2g hỗn hợp A gồm Fe và kim loại R hóa trị 2 vào dung dịch HCl dư thu được 8,96 lít ở đktc. Mặt khác khi hòa tan hoàn toàn 9,2g kim loại R trong 1000 ml dung dịch HCl 1m thu được dung dịch B làm quỳ tím chuyển đỏ. a) Xác định kim loại R Các anh giúp em với mai em phải nộp rồi
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