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a. Để đốt cháy hoàn toàn 7,2 gam magie cần phải dùng bao nhiêu lít khí oxi (đktc)? b. Tính khối lượng thuốc tím (KMnO4) cần dùng để điều chế được lượng oxi nói trên c. Chỉ ra sự oxi hoá, phản ứng hoá hợp, phản ứng phân huỷ trong các PTHH có ở trên.
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