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2 năm trước
Câu 1: Để đốt cháy hết m gam sắt cần 4,48 lít oxi (đktc) thu được oxi sắt từ (Fe3O4). a. Viết PTHH xảy ra. b. Tính m và khối lượng Fe3O4 thu được. Câu 2: a. Nung nóng m (gam) KMnO4 thu được 13,44 (lít) khí O2 ở (đktc). + Viết PTHH xảy ra. + Tính m ? b. Nếu dùng 13,44 lít oxi (đktc) ở phản ứng trên để đốt cháy 18,9 gam Al thì thu được bao nhiêu gam nhôm oxit ?
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