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Câu 2: a/ Để đốt cháy 12 g Cacbon (C) , cần bao nhiêu lít khí O2 (đktc)? b/ Để điều chế được lượng oxi kể trên thì cần bao nhiêu gam KMnO4. Giả sử các phản ứng xảy ra hoàn toàn. ( Cho C=12; O=16; Mn=55; K=39 )
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