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五(Wu)氧(Yang)化(Hua)二(?)磷(Lin)是(Shi)纯(Chun)净(Jing)物(Wu),(?)纯(Chun)净(Jing)物(Wu)的(De)概(Gai)念(Nian)是(Shi)一(Yi)种(Zhong)物(Wu)质(Zhi),(?)一(Yi)种(Zhong)元(Yuan)素(Su)可(Ke)以(Yi)组(Zu)成(Cheng)一(Yi)种(Zhong)物(Wu)质(Zhi),(?)多(Duo)种(Zhong)元(Yuan)素(Su)也(Ye)可(Ke)以(Yi)组(Zu)成(Cheng)一(Yi)种(Zhong)物(Wu)质(Zhi)。(?)判(Pan)断(Duan)是(Shi)否(Fou)为(Wei)纯(Chun)净(Jing)物(Wu),(?)看(Kan)几(Ji)种(Zhong)物(Wu)质(Zhi)组(Zu)成(Cheng),(?)而(?)不(Bu)是(Shi)看(Kan)几(Ji)种(Zhong)元(Yuan)素(Su)。(?)例(Li)如(Ru),(?)湖(Hu)北(Bei)五(Wu)氧(Yang)化(Hua)二(?)磷(Lin)厂(Chang)家(Jia)讲(Jiang)述(Shu)工(Gong)业(Ye)五(Wu)氧(Yang)化(Hua)二(?)磷(Lin)是(Shi)由(You)氧(Yang)元(Yuan)素(Su)和(He)磷(Lin)元(Yuan)素(Su)两(Liang)种(Zhong)元(Yuan)素(Su)组(Zu)成(Cheng)的(De)纯(Chun)净(Jing)物(Wu),(?)而(?)铁(Tie)则(Ze)是(Shi)由(You)一(Yi)种(Zhong)元(Yuan)素(Su)铁(Tie)元(Yuan)素(Su)组(Zu)成(Cheng)的(De)纯(Chun)净(Jing)物(Wu)。(?)
氯(Lu)气(Qi)并(Bing)不(Bu)与(Yu)五(Wu)氧(Yang)化(Hua)二(?)磷(Lin)反(Fan)应(Ying)。(?)
但(Dan)是(Shi)如(Ru)果(Guo)氯(Lu)气(Qi)中(Zhong)水(Shui)蒸(Zheng)气(Qi)含(Han)量(Liang)高(Gao),(?)与(Yu)五(Wu)氧(Yang)化(Hua)二(?)磷(Lin)反(Fan)应(Ying)为(Wei)磷(Lin)酸(Suan),(?)氯(Lu)气(Qi)在(Zai)磷(Lin)酸(Suan)中(Zhong)是(Shi)否(Fou)歧(Qi)化(Hua)是(Shi)需(Xu)要(Yao)考(Kao)虑(Lu)的(De)(是(Shi)否(Fou)歧(Qi)化(Hua)我(Wo)也(Ye)不(Bu)知(Zhi)道(Dao),(?)但(Dan)是(Shi)出(Chu)于(Yu)严(Yan)谨(Jin)还(Huan)是(Shi)得(De)说(Shuo))
五(Wu)氧(Yang)化(Hua)二(?)磷(Lin)是(Shi)一(Yi)种(Zhong)无(Wu)机(Ji)物(Wu),(?)化(Hua)学(Xue)式(Shi)P2O5,(?)由(You)磷(Lin)在(Zai)氧(Yang)气(Qi)中(Zhong)燃(Ran)烧(Shao)生(Sheng)成(Cheng),(?)为(Wei)白(Bai)色(Se)无(Wu)定(Ding)形(Xing)粉(Fen)末(Mo)或(Huo)六(Liu)方(Fang)晶(Jing)体(Ti),(?)易(Yi)吸(Xi)湿(Shi),(?)360℃(?)升(Sheng)华(Hua),(?)溶(Rong)于(Yu)水(Shui)产(Chan)生(Sheng)大(Da)量(Liang)热(Re)并(Bing)生(Sheng)成(Cheng)磷(Lin)酸(Suan),(?)对(Dui)乙(Yi)醇(Chun)的(De)反(Fan)应(Ying)与(Yu)水(Shui)相(Xiang)似(Si),(?)相(Xiang)对(Dui)密(Mi)度(Du)2.39g/cm,(?)熔(Rong)点(Dian)580~(?)585℃(?),(?)为(Wei)酸(Suan)性(Xing)氧(Yang)化(Hua)物(Wu)有(You)腐(Fu)蚀(Shi)性(Xing),(?)不(Bu)可(Ke)用(Yong)手(Shou)直(Zhi)接(Jie)触(Chu)摸(Mo)或(Huo)食(Shi)用(Yong),(?)也(Ye)不(Bu)可(Ke)直(Zhi)接(Jie)闻(Wen)气(Qi)味(Wei)。(?)