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Properties of substance:

rubidium fluoride

Group of substances:

inorganic

Physical appearance:

colorless cubic crystals

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

FRb

Structural formula as text:

RbF

Molar/atomic mass: 104.47

Melting point (°C):

775

Boiling point (°C):

1410

Solubility (g/100 g of solvent):

acetone: 0.00036 (18°C) [Ref.]
acetone: 0.0005 (24°C) [Ref.]
acetone: 0.00039 (37°C) [Ref.]
acetonitrile: 0.0021 (25°C) [Ref.]
ammonia liquid : insoluble [Ref.]
benzene: 0.000000204 (24°C) [Ref.]
bromine trifluoride: soluble [Ref.]
cyclohexane: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
dimethylformamide: 0.0117 (24°C) [Ref.]
ethanol: insoluble [Ref.]
hydrazine: soluble [Ref.]
hydrogen fluoride : 109.82 (20°C) [Ref.]
hydrogen fluoride : 138.1 (30.1°C) [Ref.]
methanol: soluble [Ref.]
nitrobenzene: insoluble [Ref.]
pyridine: insoluble [Ref.]
tetrahydrofuran: 0.000094 (24°C) [Ref.]
water: 300 (18°C) [Ref.]

Hygroscopic:

yes

Vapour pressure (Torr):

1 (827°C)
10 (972°C)
100 (1168°C)

Surface tension (mN/m):

125 (800°C)
121 (850°C)
117 (900°C)
113 (950°C)
109 (1000°C)

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

-549.3 (s)

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

-523.4 (s)

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

75.3 (s)

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

50.6 (s)

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

17.3

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

165.3

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

-334 (g)

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

237 (g)

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

35.7 (g)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1437
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 94 [Russian]
  3. Химия и технология редких и рассеянных элементов. - Ч. 1. - М.: Высшая школа, 1976. - pp. 100-101 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru