1/Một loại đá vôi chứa 80% `CaCO_3` . Nung 1 tấn đá vôi loại này có thể thu được bao nhiêu kg vôi sống `CaO` , nếu hiệu suất là 85% ? 2/Để tôi vôi , người ta đã dùng một khối lượng nước bằng 70% khối lượng vôi sống . Cho biết khối lượng nước đã dùng lớn hơn bao nhiêu lần so với khối lượng nước tính theo phương trình hóa học . $\text{*Khiên}$

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