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Properties of substance:

thorium(IV) oxide

Group of substances:

inorganic

Physical appearance:

white cubic crystals

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

O2Th

Structural formula as text:

ThO2

Molar/atomic mass: 264.04

Melting point (°C):

3200

Boiling point (°C):

4400

Solubility (g/100 g of solvent):

water: insoluble [Ref.]

Density:

9.7 (20°C, g/cm3)

Reactions:

  1. [Ref.1aster]
    ThO2 + 2C + 2Br2 → ThBr4 + 2CO

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

-1226.7 (s)

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

-1168.2 (s)

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

64.39 (s)

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

61.76 (s)

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

90

References:

  1. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 202-203 [Russian]
  2. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 105 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 105 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru