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Properties of substance:

lanthanum

Group of substances:

inorganic

Physical appearance:

hexagonal metal

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

La

Structural formula as text:

La

Molar/atomic mass: 138.91

Melting point (°C):

920

Boiling point (°C):

3950

Solubility (g/100 g of solvent):

gallium: 1 (500°C) [Ref.]
mercury: 0.0045 (0°C) [Ref.]
mercury: 0.0096 (25°C) [Ref.]
mercury: 0.0171 (50°C) [Ref.]
water: reaction [Ref.]

Numerical data:

Year of discovery: 1839
Superconducting temperature (K): 4.88 (α-form)
Superconducting temperature (K): 6 (β-form)

Density:

6.16 (20°C, g/cm3)

Vapour pressure (Torr):

1 (2156°C)
10 (2474°C)
100 (2387°C)

    Electrode potential:

    La3+ + 3e- → La, E = -2.522 V (water, 25°C)

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

    0 (s)

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

    0 (s)

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

    57.3 (s)

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

    27.6 (s)

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

    6.7

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

    413

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

    430 (g)

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

    182.3 (g)

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

    22.8 (g)

    References:

    1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 887
    2. Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
    3. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 72-73 [Russian]
    4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 75 [Russian]
    5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 595 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru