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Properties of substance:

tungsten(VI) oxytetrafluoride

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

F4OW

Structural formula as text:

WOF4

Molar/atomic mass: 275.83

Melting point (°C):

106

Boiling point (°C):

185.9

Solubility (g/100 g of solvent):

carbon disulphide: sparingly soluble [Ref.]
carbon tetrachloride: insoluble [Ref.]
water: reaction [Ref.]

Hygroscopic:

yes

Density:

5.07 (20°C, g/cm3)

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

-1445 (s)

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

8

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

56

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

-1372 (g)

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-97
  2. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 110-111 [Russian]
  3. Фторидный процесс получения вольфрама. - М.: Наука, 1981. - pp. 41-43 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru