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vanhoangtdht
2 năm trước
Một lít dung dịch A chứa 0,05 mol Na2SO4; 0,1 mol KCl; 0,05 mol NaCl. Phải dùng NaCl và K2SO4 để pha với nước thành 200ml dung dịch A. Tính tổng khối lượng 2 muối NaCl và K2SO4 phải dùng để pha chế được 400ml A.
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