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Properties of substance:

hydrogen disulfide

Group of substances:

inorganic

Physical appearance:

yellow oily liquid

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

H2S2

Structural formula as text:

HSSH

Molar/atomic mass: 66.15

Melting point (°C):

-89.8

Boiling point (°C):

70.7

CAS №: 13465-07-1

Solubility (g/100 g of solvent):

benzene: soluble [Ref.]
carbon disulphide: soluble [Ref.]
chloroform: soluble [Ref.]

Density:

1.334 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1aster]
    H2S5 → H2S2 + 3S

Refractive index (nD):

1.631 (20°C)

Dissociation:

pKa (1) = 4 (20°C, water)

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

-18.3 (l)

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

92.95 (l)

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

15.5 (g)

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

51.5 (g)

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

33.78 (l) [25°C] [Ref.]

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-13
  2. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-67
  3. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 325 [Russian]
  4. Неорганическая химия. - Под ред. Третьякова Ю.Д., Т.2. - М.: Academa, 2004. - pp. 246 [Russian]
  5. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 456 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru