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2 năm trước
Cho 5,5 g hỗn hợp Na2CO3 và Na2SO3 tác dụng hết với dung dịch HCl dư thu đc 1,12 lít hỗn hợp khí ở đktc .Tính phần trăm khối lượng mỗi chất trong hỗn hợp đầu
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