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Properties of substance:

сopper(I) sulfide

Group of substances:

inorganic

Physical appearance:

black rhombic crystals

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

Cu2S

Structural formula as text:

Cu2S

Molar/atomic mass: 159.15

Melting point (°C):

1129

Solubility (g/100 g of solvent):

ethanol: insoluble [Ref.]
water: insoluble [Ref.]

Density:

5.6 (20°C, g/cm3)

Dissociation:

pKsp (0) = 48 (20°C, water)

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

-79.5 (s)

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

-86.3 (s)

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

121 (s)

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

76.32 (s)

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

11.3

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 496
  2. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 268 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 80-81 [Russian]
  4. Химическая энциклопедия. - Т. 3. - М.: Советская энциклопедия, 1992. - pp. 5 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru