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Properties of substance:

niobium(V) chloride

Group of substances:

inorganic

Physical appearance:

monoclinic crystals

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

Cl5Nb

Structural formula as text:

NbCl5

Molar/atomic mass: 270.17

Melting point (°C):

205

Boiling point (°C):

247.5

Solubility (g/100 g of solvent):

acetic acid: soluble [Ref.]
acetone: soluble [Ref.]
carbon disulphide: soluble [Ref.]
carbon tetrachloride: soluble [Ref.]
chloroform: soluble [Ref.]
diethyl ether: soluble [Ref.]
ethanol: soluble [Ref.]
iodine monochloride: very soluble [Ref.]
propylene carbonate: 85 (25°C) [Ref.]
water: reaction [Ref.]

Density:

2.75 (20°C, g/cm3)

Reactions:

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

Vapour pressure (Torr):

10 (142.6°C)
100 (186.3°C)

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

-797.5 (s)

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

-687.7 (s)

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

226 (s)

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

147.9 (s)

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

33.9

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

52.3

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

-703 (g)

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

407 (g)

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

120.5 (g)

LD50 (mg/kg):

1400 (rats, oral)
830 (mice, oral)

References:

  1. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 174-175 [Russian]
  2. 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