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chunngo01
2 năm trước
câu 1: đốt cháy hết 6,2g photpho. hãy tính a) khối lượng diphotpho pentaoxit -P2O5thu được b) khối lượng khí oxi đã dùng bằng 2 cách Câu 2: đốt cháy hoàn toàn 5,94 gam bột nhôm (Al) cần dùng V lít khí O2 (dktc), tạo ra m gam nhôm oxit (Al2O3) a) tính V lít khí O2 tham gia phản ứng b) tính m gam Al2O3 tạo ra ( bằng 2 cách Câu 3: khi đốt dây sắt, sắt phản ứng với oxi theo phương trình 3Fe + 2O2 → Fe3O4 tính thể tích khí O2 (đktc) cần dùng để phản ứng hoàn toàn với 16,8 gam Fe
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