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Properties of substance:

selenium dioxide

Group of substances:

inorganic

Physical appearance:

colorless tetragonal crystals

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

O2Se

Structural formula as text:

SeO2

Molar/atomic mass: 110.96

Sublimation point (°C):

337

Decomposition temperature (°C):

1000

Solubility (g/100 g of solvent):

acetic acid: 10.6 (12.9°C) [Ref.]
acetone: 55 (15.3°C) [Ref.]
ethanol: 6.67 (14°C) [Ref.]
methanol: 84.3 (11.8°C) [Ref.]
sulfuric acid: soluble [Ref.]
water: 38.5 (11.3°C) [Ref.]
water: 264 (22°C) [Ref.]
water: 472 (65°C) [Ref.]

Hygroscopic:

yes

Density:

3.954 (16°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1aster]
    Se + 4HNO3 → H2SeO3 + 4NO2 + H2O
    H2SeO3 → SeO2 + H2O
  2. [Ref.1aster]
    Se + O2 → SeO2

Reactions:

  1. [Ref.1aster, Ref.2aster, Ref.3aster, Ref.4aster, Ref.5aster]
    SeO2 + H2O2 → H2SeO4

Vapour pressure (Torr):

0.1 (155°C)
1 (189°C)
10 (231°C)
100 (282°C)

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

-225.5 (s)

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

-173.5 (s)

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

56.9 (s)

ΔHsublimation (kJ/mol):

91.2

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

-127 (g)

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

264.8 (g)

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

42.7 (g)

LD50 (mg/kg):

4 (rabbits, subcutaneous)

References:

  1. Inorganic Syntheses. - Vol. 1. - New York and London, 1939. - pp. 117-120
  2. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1486
  3. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 360 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 96 [Russian]
  5. Реакции и методы исследования органических соединений. - Кн. 1. - М.-Л. 1951. - pp. 103 [Russian]
  6. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 342 [Russian]
  7. Справочник по растворимости. - Т.1, Кн.2. - М.-Л.: ИАН СССР, 1962. - pp. 983 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru