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Properties of substance:
ruthenium(VIII) oxide
Group of substances:
inorganic
Physical appearance:
monoclinic crystals
Empirical formula (Hill's system for organic substances):
O
4
Ru
Structural formula as text:
RuO4
Molar/atomic mass: 165.07
Melting point (°C):
25.4
Decomposition temperature (°C):
100
Solubility (g/100 g of solvent):
benzene
: explodes [
Ref.
]
bromine liquid
: soluble [
Ref.
]
carbon tetrachloride
: soluble [
Ref.
]
chloroform
: soluble [
Ref.
]
diethyl ether
: reaction [
Ref.
]
ethanol
: explodes [
Ref.
]
hydrogen cyanide
: explodes [
Ref.
]
pyridine
: reaction [
Ref.
]
sulfur dioxide
: soluble [
Ref.
]
water
: 1.712 (0°C) [
Ref.
]
water
: 2.033 (20°C) [
Ref.
]
water
: 2.162 (25°C) [
Ref.
]
water
: 2.113 (30°C) [
Ref.
]
water
: 2.088 (50°C) [
Ref.
]
water
: 2.141 (70°C) [
Ref.
]
water
: 2.229 (75°C) [
Ref.
]
Density:
3.29 (21°C, g/cm
3
)
Vapour pressure (Torr):
1.38 (0.4°C)
2.01 (5.2°C)
3.14 (10.1°C)
6.4 (20°C)
8.6 (21.96°C)
9.5 (24°C)
10.7 (25.86°C)
14.6 (30.3°C)
18.2 (34.9°C)
22.2 (38.52°C)
34.6 (46.7°C)
48.4 (54°C)
56.3 (57.9°C)
92.7 (68.4°C)
123 (76.1°C)
128.4 (77.03°C)
213.2 (90.8°C)
Electrode potential:
RuO
4
+ e
-
→ RuO
4
-
, E = 1 V (water, 25°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-239.3 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-150.6 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
141 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
10.9
ΔH
sublimation
(kJ/mol):
55.2
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-228 (l)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
177.4 (l)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-184 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
290.7 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
75.8 (g)
References:
Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 410 [Russian]
Звягинцев О.Е., Колбин Н.И., Рябов А.Н., Автократова Т.Д., Горюнов А.А. Химия рутения. - М.: Наука, 1965. - pp. 42-57 [Russian]
Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 412-413 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 94 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru