Để đốt cháy nhôm người ta cần dùng 6,72 (l) khí oxi (đktc). 1. Viết phương trình phản ứng xảy ra? 2. Tính khối lượng nhôm cần dùng? 3. Tính khối lượng KMnO4 cần để điều chế lượng oxi trên

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