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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/cm
3
)
16.63 (1130°C, d
4
)
Vapour pressure (Torr):
0.1 (2166°C)
1 (2456°C)
10 (2824°C)
100 (3205°C)
Electrode potential:
U
3+
+ 3e
-
→ U, E = -1.66 V (water, 25°C)
U
4+
+ 4e
-
→ U, E = -1.38 V (water, 25°C)
U
4+
+ e
-
→ U
3+
, E = -0.52 V (water, 25°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
0 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
0 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
50.3 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
27.5 (s)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
536 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
199.7 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
23.7 (g)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
9.2
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
494
References:
Аналитическая химия урана. - М.: ИАН, 1962. - pp. 10 [Russian]
Бекман И.Н. Радиохимия. Том II: Радиоактивные элементы. - М.: Издатель Мархитин П.Ю., 2014. - pp. 171-244 [Russian]
Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 568-584 [Russian]
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 52 [Russian]
Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 92, 96 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 106 [Russian]
Физические величины. - Под ред. Григорьева И.С., Мейлихова Е.З. - М.: Энергоатомиздат, 1991. - pp. 1039 [Russian]
Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 41-43 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru