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Properties of substance:

phosphorus(III) bromide

Synonyms:

phosphorus tribromide

Group of substances:

inorganic

Physical appearance:

colorless fuming liquid

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

Br3P

Structural formula as text:

PBr3

Molar/atomic mass: 270.69

Melting point (°C):

-40.5

Boiling point (°C):

173.3

CAS №: 7789-60-8

Solubility (g/100 g of solvent):

arsenic tribromide: very soluble [Ref.]
carbon disulphide: soluble [Ref.]
carbon tetrachloride: soluble [Ref.]
chloroform: soluble [Ref.]
diethyl ether: soluble [Ref.]
ethanol: reaction [Ref.]
water: reaction [Ref.]

Density:

2.87 (20°C, g/cm3)

Refractive index (nD):

1.697 (26.6°C)

Vapour pressure (Torr):

10 (44.7°C)
100 (102.3°C)

Permittivity (dielectric constant):

3.9 (20°C)

Dipole moment (D):

6 (20°C)

Surface tension (mN/m):

44.7 (0°C)
36 (100°C)

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

-132 (g)

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

-155.7 (g)

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

348 (g)

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

76.1 (g)

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

-177 (l)

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

38.7

References:

  1. Bretherick's Handbook of Reactive Chemical Hazards. - 6 ed., Vol. 1. - Butterworth-Heinemann, 1999. - pp. 115-116
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 107-108 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru