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cuoc18032001
2 năm trước
Câu 25 : Hãy tính khối lượng chất tan có trong các dung dịch sau : 1) 150 gam dd KOH 16% 2) 250 ml dd H2SO4 0,5M 3) 350 ml dd CuSO4 24% có khối lượng riêng 1,12g/ml 4) 240 ml dd hỗn hợp gồm NaOH 0,4 M và KOH 0,6 M
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