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Properties of substance:

silver sulfide alpha form

Group of substances:

inorganic

Physical appearance:

black cubic crystals

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

Ag2S

Structural formula as text:

Ag2S

Molar/atomic mass: 247.8

Melting point (°C):

825

Solubility (g/100 g of solvent):

water: insoluble [Ref.]

Density:

7.317 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1aster, Ref.2]
    2Ag + S → Ag2S

Reactions:

  1. [Ref.1]
    Ag2S + Cl2 → 2AgCl + S

Dissociation:

pKsp (0) = 49.2 (20°C, water)

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

-32.8 (s)

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

-40.8 (s)

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

144 (s)

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

76.53 (s)

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

14.06

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 73
  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. - 2-е изд. - Л.: Химия, 1978. - pp. 100 [Russian]
  4. Реми Г. Курс неорганической химии. - Т.2. - М., 1966. - pp. 436 [Russian]
  5. Рипан Р., Четяну И. Неорганическая химия. - Т.2. - М.: Мир, 1972. - pp. 741-742 [Russian]
  6. Самсонов Г.В., Дроздова С.В. Сульфиды. – М.: Металлургия, 1972. - pp. 38-41 [Russian]
  7. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 322-323 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru