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Bài 2: Trong PTN, người ta điều chế oxit sắt từ Fe3O4 bằng cách cho Fe tác dụng với oxi ở nhiệt độ cao. Tính số gam Fe và oxi cần dùng để có thể điều chế được 23,2 g Fe3O4. Bài 3:Đốt cháy 12,4 gam Photpho trong lọ chứa khí oxi dư tạo Điphotpho pentaoxit P2O5. Tính thể tích oxi (ở đktc) cần để tác dụng hết với lượng photpho đó. Bài 4: Để đốt cháy hết m gam Nhôm (Al) cần 3,36 lít khí oxi (ở đktc). Tìm m biết sản phẩm tạo ra Nhôm oxit Al2O3.
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