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Properties of substance:

cesium superoxide

Group of substances:

inorganic

Physical appearance:

yellow tetragonal crystals

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

CsO2

Structural formula as text:

CsO2

Molar/atomic mass: 164.9

Melting point (°C):

515

Decomposition temperature (°C):

350

Solubility (g/100 g of solvent):

water: reaction [Ref.]

Numerical data:

Year of discovery: 1906

Density:

3.77 (19°C, g/cm3)

Reactions:

  1. [Ref.1]
    CsO2 + O3 → CsO3 + O2

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

-286 (s)

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

-211.3 (s)

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

142 (s)

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

79 (s)

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

20

References:

  1. Вольнов И.И. Перекисные соединения щелочных металлов. - М.: Наука, 1980. - pp. 140-143 [Russian]
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 112 [Russian]
  3. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 334 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru