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Properties of substance:

sulfur trioxide γ 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

Solubility (g/100 g of solvent):

dimethylsulfoxide: very soluble [Ref.]
hydrogen fluoride : reaction [Ref.]
sulfuric acid: reaction [Ref.]

Vapour pressure (Torr):

0.1 (-32.7°C)
1 (-15.5°C)
10 (4.3°C)
100 (27.4°C)

Dipole moment (D):

0 (20°C)

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

-439 (l)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

-368.4 (l)

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

122 (l)

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

180 (l)

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

30

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

40.8

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

-395.8 (g)

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

256.7 (g)

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

50.7 (g)

LD50 (mg/kg):

1.5-2 (rabbits, onto the skin)

Critical temperature (°C):

218

Critical pressure (MPa):

8.2

Critical density (g/cm3):

0.633

References:

  1. Bell C.F. Syntheses and Physical Studies of Inorganic Compounds. - Pergamon Press, 1972. - pp. 102-112
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 97 [Russian]
  3. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 333 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru