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Properties of substance:

lanthanum oxide

Group of substances:

inorganic

Physical appearance:

colorless hexagonal crystals

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

La2O3

Structural formula as text:

La2O3

Molar/atomic mass: 325.81

Melting point (°C):

2320

Boiling point (°C):

4200

CAS №: 1312-81-8

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
ethanol: soluble [Ref.]
potassium fluoride fused: 2 (1000°C) [Ref.]
sodium fluoride fused: 0.64 (1000°C) [Ref.]
sodium hexafluoroaluminate molten: 23.2 (1050°C) [Ref.]
water: 0.0000405 (18°C) [Ref.]
water: reaction (100°C) [Ref.]

Density:

6.51 (15°C, g/cm3)

Reactions:

  1. [Ref.1, Ref.2, Ref.3]
    La2O3 + 3H2O → 2La(OH)3

Permittivity (dielectric constant):

20

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

-1793.1 (s)

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

-1705.8 (s)

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

128.4 (s)

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

107.95 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-70
  2. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 894
  3. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 288 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 76 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru