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Properties of substance:

niobium(V) fluoride

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

F5Nb

Structural formula as text:

NbF5

Molar/atomic mass: 187.9

Melting point (°C):

79.5

Boiling point (°C):

234.5

Solubility (g/100 g of solvent):

acetic acid: soluble [Ref.]
bromine trifluoride: 18.6 (25°C) [Ref.]
carbon tetrachloride: soluble [Ref.]
chloroform: soluble [Ref.]
diethyl ether: soluble [Ref.]
ethanol: soluble [Ref.]
hydrogen fluoride : 6.8 (25°C) [Ref.]
water: reaction [Ref.]

Hygroscopic:

very hygroscopic

Density:

3.3 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1aster]
    NbCl5 + 5HF → NbF5 + 5HCl

Vapour pressure (Torr):

0.1 (45°C)
1 (67.1°C)
10 (103.8°C)
100 (163°C)

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

-1813.8 (s)

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

-1698.7 (s)

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

157.3 (s)

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

134.85 (s)

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

12.2

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

51

References:

  1. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 88 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru