Main page (Russian) Search in database (English)
Sitemap (Russian)

New version database

Properties of substance:

praseodymum

Group of substances:

inorganic

Physical appearance:

hexagonal metal

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

Pr

Structural formula as text:

Pr

Molar/atomic mass: 140.91

Melting point (°C):

932

Boiling point (°C):

3510

Solubility (g/100 g of solvent):

mercury: 0.013 (20°C) [Ref.]

Numerical data:

Year of discovery: 1885

Density:

6.77 (20°C, g/cm3)

    Electrode potential:

    Pr3+ + e- → Pr2+, E = -3.1 V (water, 25°C)
    Pr3+ + e- → Pr, E = -2.353 V (water, 25°C)
    Pr2+ + e- → Pr, E = -2 V (water, 25°C)
    Pr4+ + e- → Pr3+, E = 3.2 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)):

    73.6 (s)

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

    28.5 (s)

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

    356 (g)

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

    189.7 (g)

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

    21.4 (g)

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

    6.9

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

    297

    References:

    1. Handbook of Chemistry and Physics. - CRC Press, Inc., 2002
    2. Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
    3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 91 [Russian]
      What information do you need?




      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru