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Properties of substance:

chlorine(I) oxide

Synonyms:

dichlorine monoxide

Group of substances:

inorganic

Physical appearance:

gas

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

Cl2O

Structural formula as text:

Cl2O

Molar/atomic mass: 86.91

Melting point (°C):

-116

Boiling point (°C):

2

Solubility (g/100 g of solvent):

carbon tetrachloride: very soluble [Ref.]
water: reaction 143.6 (-9.4°C) [Ref.]

Interatomic distances and bond angles:

Interatomic distances (in pm): 170,038 (Cl-O) [gas]
Bond angles (in degrees): 110,96 (Cl-O-Cl) [gas]

Numerical data:

Year of discovery: 1834

Density:

0.00389 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1, Ref.2aster]
    2Cl2 + HgO → Cl2O + HgCl2

Reactions:

  1. [Ref.1]
    Cl2O + 2NO2 → ClONO2 + ClNO2
  2. [Ref.1aster]
    Cl2O + N2O5 → 2ClNO3

Vapour pressure (Torr):

1 (-99°C)
10 (-73°C)
100 (-39°C)

Dipole moment (D):

1.69 (20°C)

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

75.7 (g)

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

93.4 (g)

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

266.2 (g)

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

45.4 (g)

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

25.9

References:

  1. Advances in Inorganic Chemistry and Radiochemistry. - 1963. - Vol. 5. - pp. 47-52
  2. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 190-192 [Russian]
  3. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 210-211 [Russian]
  4. Никитин И.В. Химия кислородных соединений галогенов. - М.: Наука, 1986. - pp. 40-60 [Russian]
  5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 109 [Russian]
  6. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 344 [Russian]
  7. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 240-241 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru