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Properties of substance:

arsenic(III) iodide

Synonyms:

arsenic triiodide

Group of substances:

inorganic

Physical appearance:

red hexagonal crystals

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

AsI3

Structural formula as text:

AsI3

Molar/atomic mass: 455.635

Melting point (°C):

140.4

Boiling point (°C):

400

Solubility (g/100 g of solvent):

arsenic tribromide: very soluble [Ref.]
arsenic trichloride: soluble [Ref.]
benzene: soluble [Ref.]
carbon disulphide: 5.2 (20°C) [Ref.]
chloroform: soluble [Ref.]
diethyl ether: soluble [Ref.]
ethanol: soluble [Ref.]
iodine liquid: soluble [Ref.]
methylene iodide: 17.4 (12°C) [Ref.]
phosphorus tribromide : soluble [Ref.]
phosphorus trichloride: soluble [Ref.]
phosphorus(V) trichloride oxide: soluble [Ref.]
sulfur monochloride: soluble [Ref.]
sulfuryl chloride: soluble [Ref.]
thionyl chloride: soluble [Ref.]
tin tetrachloride: soluble [Ref.]
water: 6 (25°C) [Ref.]
water: reaction (100°C) [Ref.]

Density:

4.39 (15°C, g/cm3)

Reactions of synthesis:

  1. Yeild 90%. [Ref.1aster]
    As2O3 + 6KI + 6HCl → 2AsI3 + 6KCl + 3H2O

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

-64.8 (s)

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

213 (s)

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

105.8 (s)

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

21.8

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

56.5

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

30.1 (g)

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

388.2 (g)

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

80.8 (g)

References:

  1. Dean J.A. Lange's handbook of chemistry. - 1999. - pp. 3.17
  2. Inorganic Syntheses. - Vol. 1. - New York and London, 1939. - pp. 103-104
  3. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 106
  4. Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 522 [Russian]
  5. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 160-161 [Russian]
  6. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 930 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru