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đốt cháy 3,1g photpho trong bình đựng khí õi dư thu dc diphotpho pentaoxit. Viết PTHH của phản ứng. Tính khối lượng diphotpho pentaoxit thu dc.Tính thể tích khí õi đã dùng ở ĐKTC<22,4> E dg cần gấp ac giúp e
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