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Properties of substance:

osmium(VIII) oxide

Synonyms:

osmium tetraoxide

Group of substances:

inorganic

Physical appearance:

monoclinic crystals

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

O4Os

Structural formula as text:

OsO4

Molar/atomic mass: 254.228

Melting point (°C):

41

Boiling point (°C):

131

CAS №: 20816-12-0

Solubility (g/100 g of solvent):

benzene: soluble [Ref.]
carbon tetrachloride: 375 (25°C) [Ref.]
diethyl ether: soluble [Ref.]
ethanol: soluble [Ref.]
water: 5.26 (0°C) [Ref.]
water: 5.75 (10°C) [Ref.]
water: 6.44 (20°C) [Ref.]
water: 7.01 (25°C) [Ref.]

Density:

4.906 (22°C, g/cm3)

Vapour pressure (Torr):

1 (2.9°C)
10 (31.3°C)
100 (75.1°C)

Electrode potential:

OsO4 + 8H+ + 8e- → Os + 4H2O, E = 0.85 V (water, 25°C)

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

-394 (s)

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

-302.5 (s)

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

164 (s)

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

14.3

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

37.2

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

-336 (g)

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

293.6 (g)

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

74 (g)

Critical temperature (°C):

405

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-79
  2. Dean J.A. Lange's handbook of chemistry. - 1999. - pp. 3.41
  3. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1361-1362
  4. Гинзбург С.И., Езерская Н.А., Прокофьева И.В., Федоренко Н.В., Шленская В.И., Бельский Н.К. Аналитическая химия платиновых металлов. - М.: Наука, 1972. - pp. 93-94 [Russian]
  5. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 410 [Russian]
  6. Левингстон С. Химия рутения, родия, палладия, осмия, иридия, платины. - М.: Мир, 1978. - pp. 95-96 [Russian]
  7. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 380, 412-413 [Russian]
  8. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 89 [Russian]
  9. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 360 [Russian]
  10. Справочник по растворимости. - Т.1, Кн.2. - М.-Л.: ИАН СССР, 1962. - pp. 1013 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru