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Properties of substance:

sulfur trioxide α form

Group of substances:

inorganic

Physical appearance:

colorless liquid

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

O3S

Structural formula as text:

SO3

Molar/atomic mass: 80.06

Melting point (°C):

16.8

Boiling point (°C):

44.8

Solubility (g/100 g of solvent):

carbon disulphide: soluble (15°C) [Ref.]
carbon disulphide: miscible (30°C) [Ref.]
iodine pentafluoride: very soluble [Ref.]
sulfur dioxide: miscible [Ref.]
sulfuric acid: reaction [Ref.]
water: reaction [Ref.]

Density:

1.9255 (20°C, g/cm3)
1.904 (25°C, g/cm3)
1.8819 (30°C, g/cm3)
1.8588 (35°C, g/cm3)
1.8335 (40°C, g/cm3)
1.809 (45°C, g/cm3)
1.7812 (50°C, g/cm3)
1.7552 (55°C, g/cm3)
1.732 (60°C, g/cm3)
1.709 (65°C, g/cm3)
1.686 (70°C, g/cm3)
1.637 (80°C, g/cm3)
1.587 (90°C, g/cm3)
1.536 (100°C, g/cm3)
1.419 (130°C, g/cm3)
1.344 (150°C, g/cm3)
1.195 (180°C, g/cm3)
1.038 (200°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1, Ref.2]
    2SO2 + O2 → 2SO3

Reactions:

  1. [Ref.1]
    2SO3 → 2SO2 + O2
  2. Yeild 100%. [Ref.1]
    OF2 + SO3 → FSO2OOF
  3. [Ref.1]
    2BCl3 + 3SO3 → B2O3 + 3SO2Cl2
  4. [Ref.1]
    SO3 + H2O → H2SO4
  5. [Ref.1]
    NOCl + SO3 → NOCl * SO3

Vapour pressure (Torr):

0.1 (-57.8°C)
1 (-38.9°C)
10 (-16.5°C)
100 (10.7°C)

Permittivity (dielectric constant):

3.11 (18°C)

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

5.61

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. 55-56 [Russian]
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 97 [Russian]
  3. Справочник сернокислотчика. - Под ред. Малина К.М. - М.: Химия, 1971. - pp. 83-84 [Russian]
  4. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 333 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru