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thuctran2509
2 năm trước
c1:Cho 5,4g Al vào 500ml dd HCl. Tính nồng độ mol/l của chất thu đc sau pứ c2:hòa tan m g Na 2 O vào nước thu đc dd A. Trung hòa A cần 200ml dd gồm HCl 0,5M và H 2 SO 4 0,25M. Giá trị của m là c3:Trộn 100ml dd H 2 SO 4 1,1M với 100ml dd NaOH 1M thu đc ddA. Cho vào dd A 1,35g Al thì thu đc thể tích H2 ở đktc là
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