Hấp thụ hết a mol khí CO2 vào dung dịch chứa 0,48 mol Ca(OH)2 thu được a mol kết tủa. Tách lấy kết tủa, sau đó thêm tiếp 0,3a mol khí CO2 nữa, thu thêm 0,1a mol kết tủa.Thể tích các khí đo ở đktc. Tìm giá trị của V?

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