Main page (Russian) Search in database (English)

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

Half-life:

21592U = 1.4 ms ()
21692U = 6.9 ms (α (100%))
216m92U = 1.4 ms (α (100%))
21792U = 800 ms (α (about 100%))
21892U = 550 μs (α (100%))
218m92U = 660 μs (α (100%))
21992U = 55 μs (α (about 100%), β+ (0.000014%))
22292U = 1.4 μs (α (100%))
22392U = 21 μs (α (100%))
22492U = 940 μs (α (100%))
22592U = 61 ms (α (100%))
22692U = 0.5 s (α)
22792U = 1.1 min (α)
22892U = 9.1 min (α)
22992U = 58 min (α (20%); electron capture (80%))
23092U = 20.8 d (α (about 100%); heavy cluster emission 22Ne (0.000 000 000 004 8%); mass excess 31615 keV)
23192U = 4.2 d (α (0.0055%))
23292U = 68.9 y (α (about 100%); spontaneous fission (0.000 000 000 09%); heavy cluster emission 24Ne (0.000 000 000 2%))
23392U = 159 200 y (α)
23492U = 245 000 y (α (about 100%); spontaneous fission (0.0000000017%) (isotopic abundance 0,0055%))
23592U = 703 800 000 y (α (about 100%); spontaneous fission (0.0000000072%) (isotopic abundance 0,72%))
235m92U = 26.1 min (internal transition)
23692U = 23 416 000 y (α (about 100%); spontaneous fission (0.000000096%))
23792U = 6.75 d (β-)
23892U = 4 468 000 000 y (α (about 100%); spontaneous fission (0.000054%) (isotopic abundance 99,2745%))
23992U = 23.50 min (β-)
24092U = 14.1 h (β-)
24292U = 16.8 min (β- (100%))

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]

    What information do you need?




    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru