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Properties of substance:

sodium tetrasulfide

Group of substances:

inorganic

Physical appearance:

yellow tetragonal crystals

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

Na2S4

Structural formula as text:

Na2S4

Molar/atomic mass: 174.24

Melting point (°C):

294

Solubility (g/100 g of solvent):

ethanol: moderately soluble [Ref.]
water: soluble [Ref.]

Density:

2.08 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1aster]
    2NaSH + 3S → Na2S4 + H2S

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

-411.3 (s)

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

167.4 (s)

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

152.2 (s)

References:

  1. Binneweis M., Milke E. Thermochemical Data of Elements and Compounds. - 2ed, 2002. - pp. 715
  2. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 36 [Russian]
  3. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 166-167 [Russian]
  4. Лидин Р.А., Андреева Л.Л., Молочко В.А. Константы неорганических веществ. - М.: Дрофа, 2006. - pp. 140 [Russian]
  5. Самсонов Г.В., Дроздова С.В. Сульфиды. – М.: Металлургия, 1972. - pp. 28-29 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru