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Properties of substance:

tellurium

Group of substances:

inorganic

Physical appearance:

trigonal crystals

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

Te

Structural formula as text:

Te

Molar/atomic mass: 127.6

Melting point (°C):

449.8

Boiling point (°C):

990

Solubility (g/100 g of solvent):

carbon disulphide: insoluble [Ref.]
hydrogen fluoride : insoluble [Ref.]
iodine liquid: soluble [Ref.]
mercury: 0.01 (20°C) [Ref.]
methylene iodide: 0.1 (12°C) [Ref.]
water: insoluble [Ref.]

Numerical data:

Year of discovery: 1782
Hardness on the Mohs’ scale: 2.5

Density:

6.25 (25°C, g/cm3)

Reactions:

  1. [Ref.1aster, Ref.2aster]
    Te + 3F2 → TeF6
  2. [Ref.1]
    Au + 2Te → AuTe2
  3. [Ref.1]
    2K + Te → K2Te

Vapour pressure (Torr):

0.00001 (254°C)
0.0001 (289°C)
0.001 (329°C)
0.01 (376°C)
0.1 (432°C)
1 (517°C)
10 (632°C)
100 (792°C)

Electrode potential:

Te + 2H+ + 2e- → H2Te(aq), E = -0.464 V (water, °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)):

49.5 (s)

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

25.77 (s)

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

17.5

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

51

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

215.6 (g)

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

182.6 (g)

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

20.786 (g)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1526
  2. Вредные химические вещества: Неорганические соединения элементов V-VIII групп. Справочник. - Л., 1989. - pp. 288-289 [Russian]
  3. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 100-118 [Russian]
  4. Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
  5. Девяткин В.В., Ляхова Ю.М. Химия для любознательных, или о чем не узнаешь на уроке. - Ярославль: Академия Холдинг, 2000. - pp. 83 [Russian]
  6. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 103 [Russian]
  7. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 617 [Russian]
  8. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 513-515 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru