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Properties of substance:

tantalum(V) fluoride

Synonyms:

tantalum pentafluoride

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

F5Ta

Structural formula as text:

TaF5

Molar/atomic mass: 275.94

Melting point (°C):

96

Boiling point (°C):

229.2

Solubility (g/100 g of solvent):

acetic acid: sparingly soluble [Ref.]
bromine trifluoride: soluble [Ref.]
carbon disulphide: soluble [Ref.]
carbon tetrachloride: soluble [Ref.]
chloroform: soluble [Ref.]
ethanol: sparingly soluble [Ref.]
hydrogen fluoride : 0.9 (19°C) [Ref.]
pyridine: soluble [Ref.]
water: soluble [Ref.]

Hygroscopic:

yes

Density:

4.98 (15°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1, Ref.2, Ref.3]
    2Ta + 5F2 → 2TaF5

Vapour pressure (Torr):

1 (80°C)
10 (103.5°C)
100 (161.2°C)

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

-1903.6 (s)

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

-1790.8 (s)

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

170 (s)

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

130.5 (s)

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

12.6

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

51.9

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

-1828 (g)

References:

  1. Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 1049
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 103 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru