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Properties of substance:
tantalum
Group of substances:
inorganic
Physical appearance:
gray cubic metal
Empirical formula (Hill's system for organic substances):
Ta
Structural formula as text:
Ta
Molar/atomic mass: 180.95
Melting point (°C):
3015
Boiling point (°C):
5500
Solubility (g/100 g of solvent):
gallium
: 0.01 (450°C) [
Ref.
]
gallium
: 1.3 (800°C) [
Ref.
]
mercury
: insoluble [
Ref.
]
water
: sparingly soluble [
Ref.
]
Numerical data:
Year of discovery: 1802
Superconducting temperature (K): 4.46
Density:
16.6 (20°C, g/cm
3
)
Vapour pressure (Torr):
0.0000000031 (1927°C)
0.01 (3056°C)
0.1 (3352°C)
1 (3705°C)
10 (4135°C)
100 (4680°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)):
41.5 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
25.36 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
34.7
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
744.8
References:
Гибало И.М. Аналитическая химия ниобия и тантала. - М.: Наука, 1967. - pp. 5-16 [Russian]
Ниобий и тантал. - М.: Металлургия, 1990 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 102 [Russian]
Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 494-495 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru