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Properties of substance:

mercury(I) iodide

Group of substances:

inorganic

Physical appearance:

yellow tetragonal crystals

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

Hg2I2

Structural formula as text:

Hg2I2

Molar/atomic mass: 654.99

Sublimation point (°C):

140

Decomposition temperature (°C):

290

Solubility (g/100 g of solvent):

diethyl ether: insoluble [Ref.]
ethanol: insoluble [Ref.]
water: 0.00000002 (25°C) [Ref.]

Density:

7.7 (20°C, g/cm3)

Dissociation:

pKsp (0) = 28.35 (20°C, water)

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

-120.9 (s)

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

-111.2 (s)

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

235.2 (s)

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

97.9 (s)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 640
  2. Гладышев В.П., Левицкая С.А., Филлипова Л.М. Аналитическая химия ртути. - М.: Наука, 1974. - pp. 29 [Russian]
  3. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 208 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 92 [Russian]
  5. Реми Г. Курс неорганической химии. - Т.2. - М., 1966. - pp. 499 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru