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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/cm3)

Reactions:

  1. [Ref.1, Ref.2, Ref.3]
    2Ta + 5F2 → 2TaF5

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 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)):

41.5 (s)

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

25.36 (s)

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

34.7

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

744.8

References:

  1. Гибало И.М. Аналитическая химия ниобия и тантала. - М.: Наука, 1967. - pp. 5-16 [Russian]
  2. Ниобий и тантал. - М.: Металлургия, 1990 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 102 [Russian]
  4. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 494-495 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru