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thaomanu1007
2 năm trước
Cho những khí sau: N2, O2, Cl2, CO, SO2. Hãy cho biết : a) Những khí nào nặng hay nhẹ hơn khí hiđro và nặng hay nhẹ hơn bằng bao nhiêu lần. b) Những khí nào nặng hay nhẹ hơn không khí và nặng hay nhẹ hơn bao nhiêu lần.
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