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yenv796
2 năm trước
Nhiệt phân 15,8 gam KMnO4 thì thu được thể tích khí oxi (ở đktc) là: A. 11,2 lít. B. 2,24 lít. C. 3,36 lít. D. 4,48 lít. Đốt cháy 6,2 gam photpho trong khí oxi dư, khối lượng điphotpho pentaoxit (P2O5) thu được là: A. 14,2 gam. B. 1,42 gam. C. 0,142 gam. D. 142 gam.
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