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Properties of substance:

Group of substances:

inorganic

Physical appearance:

colorless liquid

Empirical formula (Hill's system for organic substances):

D2O

Structural formula as text:

DOD

Molar/atomic mass: 20.03

Melting point (°C):

3.81

Boiling point (°C):

101.43

CAS №: 7789-20-0

Solubility (g/100 g of solvent):

diethyl ether: sparingly soluble [Ref.]
ethanol: miscible [Ref.]
water: 161 (2.351°C) [Ref.]
water: 1567 (3.578°C) [Ref.]
water: miscible (3.802°C) [Ref.]

Numerical data:

Year of discovery: 1932

Density:

1.10602 (11.24°C, g/cm3)
1.1042 (25°C, g/cm3)

Refractive index (nD):

1.32844 (20°C)

Vapour pressure (Torr):

10 (13.1°C)
100 (54°C)

Permittivity (dielectric constant):

78.2 (25°C)

Dipole moment (D):

1.86 (20°C)

Viscosity (mPa·s):

0.969 (30°C)
0.713 (45°C)
0.552 (60°C)
0.445 (75°C)
0.365 (90°C)
0.323 (100°C)

Surface tension (mN/m):

72.6 (20°C)
71.85 (25°C)
71.1 (30°C)

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

-294.6 (l)

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

-243.48 (l)

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

75.9 (l)

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

84.3 (l)

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

5.301

Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

45.4

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

-249.2 (g)

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

-234.56 (g)

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

198.24 (g)

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

34.34 (g)

Enthalpy (heat) of solution ΔsolH (kJ)

0.0636 (l) [solvent: water, 25°C, 1 mol in 1 mol of water] [Ref.]

Critical temperature (°C):

370.9

Critical pressure (MPa):

21.86

Critical density (g/cm3):

0.363

References:

  1. Вредные вещества в промышленности: Справочник для химиков, инженеров и врачей. - 7-е изд., Т.3. - Л.: Химия, 1976. - pp. 12 [Russian]
  2. Жуков И.И. Тяжелая вода и ее свойства. - Л., 1934 [Russian]
  3. Крель Э. Руководство по лабораторной перегонке. - М.: Химия, 1980. - pp. 224-233 [Russian]
  4. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 542-543 [Russian]
  5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 59 [Russian]
  6. Суслов Б.Н. Тяжелая вода. - М.: ГИТТЛ, 1958 [Russian]
  7. Сакодынский К.И., Жаворонков Н.М. Двухтемпературные методы получения тяжелой воды / Успехи химии. - 1960. - Т.29, №9. - pp. 1112-1137 [Russian]
  8. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 20-21 [Russian]
  9. Химия и жизнь. - 2008. - №1. - pp. 34-35 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru