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Properties of substance:
chromium(III) oxide
Group of substances:
inorganic
Physical appearance:
green trigonal crystals
Empirical formula (Hill's system for organic substances):
Cr
2
O
3
Structural formula as text:
Cr2O3
Molar/atomic mass: 151.99
Melting point (°C):
2335
Boiling point (°C):
2954
Decomposition temperature (°C):
2335
Solubility (g/100 g of solvent):
acetone
: insoluble [
Ref.
]
ethanol
: insoluble [
Ref.
]
hydrazine
: insoluble [
Ref.
]
hydrogen fluoride
: insoluble [
Ref.
]
water
: insoluble [
Ref.
]
Numerical data:
Hardness on the Mohs’ scale: 9
Density:
5.21 (20°C, g/cm
3
)
Reactions:
[
Ref.1
,
Ref.2
]
5Cr
2
O
3
+ 6NaBrO
3
+ 2H
2
O → 2H
2
Cr
2
O
7
+ 3Na
2
Cr
2
O
7
+ 3Br
2
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-1140.6 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-1059 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
81.2 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
118.8 (s)
Neel temperature (K):
308
References:
Беленький Е.Ф., Рискин И.В. Химия и технология пигментов. - Л.: ГНТИХЛ, 1960. - pp. 530-538 [Russian]
Лаврухина А.К., Юкина Л.В. Аналитическая химия хрома. - М.: Наука, 1979. - pp. 16 [Russian]
Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 378 [Russian]
Неорганические соединения хрома: Справочник. - Л.: Химия, 1981. - pp. 9-12 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 111 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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