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Properties of substance:
mercury(II) sulfide
Group of substances:
inorganic
Physical appearance:
red trigonal crystals
Empirical formula (Hill's system for organic substances):
HgS
Structural formula as text:
HgS
Molar/atomic mass: 232.65
Melting point (°C):
825
Solubility (g/100 g of solvent):
ethanol
: insoluble [
Ref.
]
water
: 0.00000125 (18°C) [
Ref.
]
Density:
8.1 (20°C, g/cm
3
)
Reactions of synthesis:
[
Ref.1
]
(CH
3
COO)
2
Hg + H
2
S → HgS + 2CH
3
COOH
Vapour pressure (Torr):
1 (333°C)
10 (395°C)
100 (484°C)
Electrode potential:
HgS + 2e
-
→ Hg + S
2-
, E = -0.7 V (water, 25°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-59 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-51.4 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
82.4 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
48.41 (s)
References:
Inorganic Syntheses. - Vol. 1. - New York and London, 1939. - pp. 19-20
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 652
Иванова М.А., Кононова М.А. Химический демонстрационный эксперимент. - М.: Высшая школа, 1969. - pp. 36 [Russian]
Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 204 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 93 [Russian]
Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 512 [Russian]
Энциклопедия для детей. - Т.17: Химия. - М.: Аванта+, 2004. - pp. 235 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru