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Properties of substance:

copper(II) sulfide

Synonyms:

cupric sulfide

Group of substances:

inorganic

Physical appearance:

black hexagonal crystals

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

CuS

Structural formula as text:

CuS

Molar/atomic mass: 95.61

Decomposition temperature (°C):

450

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
methylamine: sparingly soluble [Ref.]
water: 0.0000336 (18°C) [Ref.]

Numerical data:

Superconducting temperature (K): 1.62

Density:

4.68 (20°C, g/cm3)

Reactions:

  1. [Ref.1]
    CuS + S → Cu(S2)

Dissociation:

pKsp (0) = 35.2 (20°C, water)

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

-53.1 (s)

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

-53.6 (s)

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

66.5 (s)

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

47.82 (s)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 496
  2. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 36, 505 [Russian]
  3. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 274 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 81 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru