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Properties of substance:

sulfur trioxide β form

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

O3S

Structural formula as text:

SO3

Molar/atomic mass: 80.06

Melting point (°C):

32

Solubility (g/100 g of solvent):

sulfuric acid: reaction [Ref.]

Vapour pressure (Torr):

0.1 (-52.5°C)
1 (-34.1°C)
10 (-12.3°C)
100 (13.9°C)

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

12

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

40.8

Critical temperature (°C):

218

Critical pressure (MPa):

8.2

Critical density (g/cm3):

0.633

References:

  1. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 56 [Russian]
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 97 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru