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Tieutuyet
2 năm trước
Hòa tan hỗn hợp 1,69g Oleum có công thức H2SO4.3SO3 vào nước dư .Trung hòa dung dịch thu được Vml dung dịch KOH 1M . Giá trị của V là : A.20 B.40 C.30 D.10
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