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Properties of substance:

arsenic(III) oxide

Synonyms:

arsenolite

Group of substances:

inorganic

Physical appearance:

colorless cubic crystals

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

As2O3

Structural formula as text:

As2O3

Molar/atomic mass: 197.84

Melting point (°C):

278

Boiling point (°C):

461

Solubility (g/100 g of solvent):

chloroform: soluble [Ref.]
ethanol: soluble [Ref.]
water: 1.2 (0°C) [Ref.]
water: 1.8 (20°C) [Ref.]
water: 2.05 (25°C) [Ref.]
water: 2.9 (40°C) [Ref.]
water: 4.4 (60°C) [Ref.]
water: 5.6 (75°C) [Ref.]
water: 8.2 (98.5°C) [Ref.]

Density:

3.865 (25°C, g/cm3)

Vapour pressure (Torr):

0.1 (181°C)
1 (214°C)
100 (333°C)

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

48.5

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

56.1

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

-656.972 (s) [for As2O3 cubic] [Ref.]

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

-575.958 (s) [for As2O3 cubic] [Ref.]

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

107.412 (s) [for As2O3 cubic] [Ref.]

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

96.878 (s) [for As2O3 cubic] [Ref.]

LD50 (mg/kg):

10 (mice, intraperitoneal)

References:

  1. Dean J.A. Lange's handbook of chemistry. - 1999. - pp. 3.17
  2. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 471-472 [Russian]
  3. 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