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Properties of substance:

phosphorus(III) oxide

Group of substances:

inorganic

Physical appearance:

white monoclinic crystals

Empirical formula (Hill's system for organic substances):

O6P4

Structural formula as text:

P4O6

Molar/atomic mass: 219.89

Melting point (°C):

23.8

Boiling point (°C):

175.4

Solubility (g/100 g of solvent):

benzene: soluble [Ref.]
carbon disulphide: soluble [Ref.]
chloroform: soluble [Ref.]
diethyl ether: soluble [Ref.]
water: reaction [Ref.]

Hygroscopic:

very hygroscopic

Density:

2.135 (21°C, g/cm3)

Vapour pressure (Torr):

10 (52.9°C)
37.5 (70°C)
100 (107.7°C)

Surface tension (mN/m):

37 (30°C)
34.7 (50°C)
31.2 (80°C)
27.7 (110°C)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-1593.7 (g)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

346.9 (g)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

145.6 (g)

Molar enthalpy (heat) of fusion ΔfusH (kJ/mol):

14.1

Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

43.4

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-1640 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-80
  2. Везер В. Фосфор и его соединения. - М.: ИИЛ, 1962. - pp. 224-226 [Russian]
  3. Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 470-471 [Russian]
  4. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 446 [Russian]
  5. Неорганическая химия. - Под ред. Третьякова Ю.Д., Т.2. - М.: Academa, 2004. - pp. 193 [Russian]
  6. Постников Н.Н. Термическая фосфорная кислота. Химия и технология. - М.: Химия, 1970. - pp. 41-42 [Russian]
  7. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 108 [Russian]
  8. Реми Г. Курс неорганической химии. - Т.1. - М., 1963. - pp. 683-684 [Russian]
  9. Руководство по неорганическому синтезу. - Т.2, под ред. Брауэра Г. - М.: Мир, 1985. - pp. 568-570 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru