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Properties of substance:

potassium pentasulfide



skc-file

Group of substances:

inorganic

Physical appearance:

triclinic crystals

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

K2S5

Structural formula as text:

K2S5

Molar/atomic mass: 238.5216

Melting point (°C):

207

Decomposition temperature (°C):

300

Solubility (g/100 g of solvent):

ethanol: sparingly soluble [Ref.]
water: very soluble [Ref.]

Hygroscopic:

yes

Interatomic distances and bond angles:

Interatomic distances (in pm): 332,1 (K(1)-S(1)) [crystals]
Interatomic distances (in pm): 321,5 (K(2)-S(5)) [crystals]
Interatomic distances (in pm): 203,7 (S(1)-S(2)) [crystals]
Interatomic distances (in pm): 207,4 (S(2)-S(3)) [crystals]
Interatomic distances (in pm): 207,5 (S(3)-S(4)) [crystals]
Interatomic distances (in pm): 205 (S(4)-S(5)) [crystals]
Bond angles (in degrees): 109,7 (S(1)-S(2)-S(3)) [crystals]
Bond angles (in degrees): 106,4 (S(2)-S(3)-S(4)) [crystals]
Bond angles (in degrees): 108,7 (S(3)-S(4)-S(5)) [crystals]

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

-475 (s)

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

257 (s)

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

166 (s)

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

7.2

References:

  1. Journal of the Chemical Society, Dalton Transactions. - 1976. - No. 14. - pp. 1314-1316 [DOI: 10.1039/DT9760001314]
  2. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 132-133 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru