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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/cm
3
)
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
-
→ H
2
Te
(aq)
, E = -0.464 V (water, °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)):
49.5 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
25.77 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
17.5
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
51
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
215.6 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
182.6 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
20.786 (g)
References:
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1526
Вредные химические вещества: Неорганические соединения элементов V-VIII групп. Справочник. - Л., 1989. - pp. 288-289 [Russian]
Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 100-118 [Russian]
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
Девяткин В.В., Ляхова Ю.М. Химия для любознательных, или о чем не узнаешь на уроке. - Ярославль: Академия Холдинг, 2000. - pp. 83 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 103 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 617 [Russian]
Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 513-515 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru