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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):

O4Ru

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/cm3)

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:

RuO4 + e- → RuO4-, E = 1 V (water, 25°C)

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

-239.3 (s)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

-150.6 (s)

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

141 (s)

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

10.9

ΔHsublimation (kJ/mol):

55.2

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

-228 (l)

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

177.4 (l)

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

-184 (g)

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

290.7 (g)

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

75.8 (g)

References:

  1. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 410 [Russian]
  2. Звягинцев О.Е., Колбин Н.И., Рябов А.Н., Автократова Т.Д., Горюнов А.А. Химия рутения. - М.: Наука, 1965. - pp. 42-57 [Russian]
  3. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 412-413 [Russian]
  4. 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