hỗn hợp X gồm K, K2O,Ca, CaO. hòa tan hết hỗn hợp X vào Nước thu được 2,464 lít khí H2 dung dịch Y. Hấp thụ 8,96 lít khí Co2 (đktc) vào dung dịch Y thu được dung dịch Z và có 6 g kết tủa tao thành. khối lượng chất tan có trong dung dịch Z là bao nhiêu

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