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Cho 13 g kim loại R(||) phản ứng vừa đủ với dung dịch chứa 14,6(g) axitclohiđric (HCl).Sau phản ứng thu được khí H2 và dung dịch muối clorua(RCL2) a.Tìm kim loại R b.Tính V H2 thu được ở đktc C.Tính khối lượng muối thu được
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