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2 năm trước
Giúp mình câu này đi mình hứa sẽ đánh giá 5 sao Hòa tan m gam Kali vào nước (dư) thu được dung dịch X. Để trung hòa X thì cần dùng dung dịch Y chứa 0,2 mol HCl và 0,04 mol H2SO4. Tính m.
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