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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)

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