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Properties of substance:

uranium

Group of substances:

inorganic

Physical appearance:

rhombic metal

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

U

Structural formula as text:

U

Molar/atomic mass: 238.03

Melting point (°C):

1139

Boiling point (°C):

4200

Solubility (g/100 g of solvent):

bismuth fused: 0.1 (271°C) [Ref.]
bismuth fused: 0.6 (500°C) [Ref.]
bismuth fused: 3.8 (700°C) [Ref.]
lead: 0.002 (416°C) [Ref.]
lead: 0.26 (806°C) [Ref.]
magnesium fused: 0.002 (650°C) [Ref.]
magnesium fused: 0.14 (1135°C) [Ref.]
mercury: 0.0014 (20°C) [Ref.]
mercury: 11.1 (320°C) [Ref.]
silver: 4.2 (1135°C) [Ref.]

Numerical data:

Year of discovery: 1789
Superconducting temperature (K): 1.8

Density:

19.04 (25°C, g/cm3)
16.63 (1130°C, d4)

Reactions:

  1. [Ref.1]
    U + 3F2 → UF6

Vapour pressure (Torr):

0.1 (2166°C)
1 (2456°C)
10 (2824°C)
100 (3205°C)

Electrode potential:

U3+ + 3e- → U, E = -1.66 V (water, 25°C)
U4+ + 4e- → U, E = -1.38 V (water, 25°C)
U4+ + e- → U3+, E = -0.52 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)):

50.3 (s)

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

27.5 (s)

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

536 (g)

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

199.7 (g)

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

23.7 (g)

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

9.2

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

494

References:

  1. Аналитическая химия урана. - М.: ИАН, 1962. - pp. 10 [Russian]
  2. Бекман И.Н. Радиохимия. Том II: Радиоактивные элементы. - М.: Издатель Мархитин П.Ю., 2014. - pp. 171-244 [Russian]
  3. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 568-584 [Russian]
  4. Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 52 [Russian]
  5. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 92, 96 [Russian]
  6. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 106 [Russian]
  7. Физические величины. - Под ред. Григорьева И.С., Мейлихова Е.З. - М.: Энергоатомиздат, 1991. - pp. 1039 [Russian]
  8. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 41-43 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru