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Properties of substance:

zinc iodide

Group of substances:

inorganic

Physical appearance:

white tetragonal crystals

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

I2Zn

Structural formula as text:

ZnI2

Molar/atomic mass: 319.18

Melting point (°C):

446

Boiling point (°C):

624

Solubility (g/100 g of solvent):

acetic acid: very soluble [Ref.]
ammonia liquid : 0.1 (25°C) [Ref.]
diethyl ether: 9.57 (20°C) [Ref.]
ethanol: soluble [Ref.]
glycerol: 40 (15.5°C) [Ref.]
iodine liquid: soluble [Ref.]
pyridine: 12.9 (18°C) [Ref.]
sulfur dioxide: 0.11 (0°C) [Ref.]
water: 430.6 (0°C) [Ref.]
water: 432 (18°C) [Ref.]
water: 446 (40°C) [Ref.]
water: 468 (60°C) [Ref.]
water: 488 (80°C) [Ref.]
water: 510 (100°C) [Ref.]

Hygroscopic:

yes

Numerical data:

Critical relative humidity (%): 18.9

Density:

4.666 (11.2°C, g/cm3)

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

-208.2 (s)

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

-209.3 (s)

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

161.5 (s)

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

16.7

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

117.2

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

-65 (g)

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

317 (g)

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

60.2 (g)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1586-1587
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 113 [Russian]
  3. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 262, 794-795 [Russian]
  4. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 252-253 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru