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Properties of substance:

oxygen difluoride

Synonyms:

fluorine monoxide
oxygen fluoride

Group of substances:

inorganic

Physical appearance:

colorless gas

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

F2O

Structural formula as text:

OF2

Molar/atomic mass: 53.996

Melting point (°C):

-223.8

Boiling point (°C):

-145

Decomposition temperature (°C):

200

Solubility (g/100 g of solvent):

fluorine liquid: miscible [Ref.]
oxygen liquid: miscible [Ref.]
ozone liquid: miscible [Ref.]
water: 0.0164 (0°C) [Ref.]

Interatomic distances and bond angles:

Interatomic distances (in pm): 140,5 (O-F) [gas]
Bond angles (in degrees): 103 (F-O-F) [gas]

Numerical data:

Year of discovery: 1927
LCt50 (mg·min/l): 0.199
LCt50 (mg·min/l): 0.345

Density:

1.9 (-223.8°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1, Ref.2aster]
    2F2 + 2NaOH → 2NaF + OF2 + H2O

Reactions:

  1. Yeild 100%. [Ref.1]
    OF2 + SO3 → FSO2OOF
  2. Yeild 80%. [Ref.1aster]
    4OF2 + 2AsF5 → 2O2AsF6 + 3F2
  3. Yeild 90%. [Ref.1]
    COF2 + 2OF2 → CF3OOOCF3

Vapour pressure (Torr):

1 (-196°C)
10 (-184°C)
100 (-167°C)

Electrode potential:

OF2 + 2H+ + 4e- → 2F- + H2O, E = 2.1 V (water, 25°C)

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

25.1 (g)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

42.5 (g)

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

246.98 (g)

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

43.3 (g)

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

11.09

Critical temperature (°C):

-58

Critical pressure (MPa):

4.95

Critical density (g/cm3):

0.553

References:

  1. Advances in Inorganic Chemistry and Radiochemistry. - 1963. - Vol. 5. - pp. 43-44
  2. Inorganic Syntheses. - Vol. 1. - New York and London, 1939. - pp. 109-111
  3. Simons J.H. Fluorine Chemistry. - Vol. 5. - New York: Academic Press, 1964. - pp. 63-64
  4. Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 593 [Russian]
  5. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 140-141 [Russian]
  6. Зрелов В.Н., Серегин Е.П. Жидкие ракетные топлива. - М.: Химия, 1975. - pp. 268-270 [Russian]
  7. Никитин И.В. Химия кислородных соединений галогенов. - М.: Наука, 1986 [Russian]
  8. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 73, 315 [Russian]
  9. Рысс И.Г. Химия фтора и его неорганических соединений. - М., 1956. - pp. 150-153 [Russian]
  10. Успехи химии. - 1971. - Т.40, №11. - pp. 1914-1918 [Russian]
  11. Фтор и его соединения. – Под ред. Саймонса Дж., Т. 1. - М.: ИИЛ, 1953. - pp. 73-75 [Russian]
  12. Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 389 [Russian]
  13. Химмотология ракетных и реактивных топлив. - Под ред. Браткова А.А. - М.: Химия, 1987. - pp. 76-77 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru