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Hòa tan hoàn toàn 18,4g hỗn hợp X gồm MgO và MgSO3 cần dùng a ml dung dịch H2SO4 1M.Sau phản ứng thu đucợ V lít khí SO2(đktc).Dẫn V lít SO2 vào dung dịch nước vôi trong dư, thu được 12g kết tủa. a.Viết PTHH b.Tính a, V,khối lượng mỗi chất trong X
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