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Properties of substance:

rubidium

Group of substances:

inorganic

Physical appearance:

cubic metal

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

Rb

Structural formula as text:

Rb

Molar/atomic mass: 85.47

Melting point (°C):

39.3

Boiling point (°C):

690

Solubility (g/100 g of solvent):

ammonia liquid : soluble [Ref.]
ethanol: reaction [Ref.]
ethylenediamine: 0.124 (20°C) [Ref.]
mercury: 0.93 (0°C) [Ref.]
mercury: 1.56 (18°C) [Ref.]
mercury: 1.22 (19.5°C) [Ref.]
mercury: 1.39 (25°C) [Ref.]
water: reaction [Ref.]

Numerical data:

Year of discovery: 1861
Hardness on the Mohs’ scale: 0.3

Density:

1.532 (20°C, g/cm3)
1.475 (39°C, g/cm3)

Vapour pressure (Torr):

0.01 (127°C)
0.1 (170°C)
1 (294°C)
10 (387°C)
100 (519°C)

    Electrode potential:

    Rb+ + e- → Rb, E = -2.925 V (water, 25°C)
    Rb+ + Hg + e- → Rb(Hg), E = -1.81 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)):

    75.7 (s)

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

    30.8 (s)

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

    2.18

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

    75.77

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

    80.9 (g)

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

    169.98 (g)

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

    20.79 (g)

    References:

    1. Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
    2. Локшин Э.П., Воскобойников Н.Б. Рубидий и цезий. - Апатиты, 1996 [Russian]
    3. Неорганические синтезы. - Сб. 1. - М.: ИИЛ, 1951. - pp. 10 [Russian]
    4. Плющев В.Е., Степин Б.Д. Аналитическая химия рубидия и цезия. - М.: Наука, 1975. - pp. 12-13 [Russian]
    5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 93 [Russian]
    6. Свойства элементов. - под общей редакцией Дрица М.Е. - М.: Металлургия, 1985. - pp. 49-54 [Russian]
    7. Химия и технология редких и рассеянных элементов. - Ч.1. - М.: Высшая школа, 1976. - pp. 83-85 [Russian]
    8. Энциклопедия для детей. - Т.17: Химия. - М.: Аванта+, 2004. - pp. 184-186 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru