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Properties of substance:

arsenic(III) oxide

Synonyms:

claudetite

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

As2O3

Structural formula as text:

As2O3

Molar/atomic mass: 197.84

Melting point (°C):

314

Boiling point (°C):

461

Solubility (g/100 g of solvent):

water: 1.2 (2°C) [Ref.]
water: 11.5 (100°C) [Ref.]

Density:

4.15 (20°C, g/cm3)

Vapour pressure (Torr):

10 (260°C)
100 (333°C)

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

56.1

Standard molar enthalpy (heat) of formation ΔfH (298 K, kJ/mol)

-654.796 (s) [for As2O3 monoclinic] [Ref.]

Standard molar Gibbs energy of formation ΔfG (298 K, kJ/mol)

-576.641 (s) [for As2O3 monoclinic] [Ref.]

Standard molar entropy S (298 K, J/(mol·K))

117.001 (s) [for As2O3 monoclinic] [Ref.]

Molar heat capacity at constant pressure Cp (298 K, J/(mol·K))

96.979 (s) [for As2O3 monoclinic] [Ref.]

Enthalpy (heat) of fusion ΔfusH (kJ/mol)

18 (s) [Ref.]

References:

  1. Dean J.A. Lange's handbook of chemistry. - 1999. - pp. 3.18
  2. Lewis R.J. Sax's Dangerous Properties of Industrial Materials. - 11ed. - Wiley-interscience, 2004. - pp. 303-304
  3. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 160-161 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 82 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru