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Properties of substance:

chromium(VI) dichloride dioxide

Synonyms:

chromyl chloride

Group of substances:

inorganic

Physical appearance:

liquid

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

Cl2CrO2

Structural formula as text:

CrO2Cl2

Molar/atomic mass: 154.9

Melting point (°C):

-95

Boiling point (°C):

116

Decomposition temperature (°C):

180

Solubility (g/100 g of solvent):

1,2-dibromoethane: miscible [Ref.]
1,2-dichloroethane: miscible [Ref.]
1-butanol: reaction [Ref.]
2-ethyl-1-hexanol: ignites [Ref.]
2-propanol: ignites [Ref.]
acetic acid: miscible with slow reaction [Ref.]
acetic anhydride: miscible with slow reaction [Ref.]
acetyl bromide: reaction [Ref.]
acetyl chloride: miscible [Ref.]
aniline: reaction [Ref.]
benzene: miscible with slow reaction [Ref.]
carbon disulphide: miscible with slow reaction [Ref.]
carbon tetrachloride: miscible [Ref.]
chloroform: soluble [Ref.]
cyclohexane: miscible with slow reaction [Ref.]
cyclohexanol: ignites [Ref.]
cyclohexylamine: reaction [Ref.]
dicyclohexylamine: reaction [Ref.]
diethyl ether: soluble [Ref.]
ethanol: reaction [Ref.]
ethylene glycol : ignites [Ref.]
formic acid 100%: insoluble [Ref.]
hexane: miscible with slow reaction [Ref.]
hydrogen fluoride : insoluble [Ref.]
mercury: insoluble [Ref.]
methanol: reaction [Ref.]
methylene chloride: miscible [Ref.]
nitric acid 100%: miscible with slow reaction [Ref.]
nitrobenzene: miscible with slow reaction [Ref.]
oil of turpentine: ignites [Ref.]
p-cymene: reaction [Ref.]
phosphoric acid 85%: insoluble [Ref.]
phosphorus(V) trichloride oxide: soluble [Ref.]
pyridine: reaction [Ref.]
sulfuric acid 70%: insoluble [Ref.]
tert-butylamine: reaction [Ref.]
thionyl chloride: miscible [Ref.]
tin tetrachloride: miscible [Ref.]
toluene: reaction [Ref.]
triethanolamine: reaction [Ref.]
water: reaction [Ref.]
xylene: reaction [Ref.]

Numerical data:

Year of discovery: 1824

Density:

1.911 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1aster]
    K2Cr2O7 + 4NaCl + 3H2SO4 → 2CrO2Cl2 + K2SO4 + 2Na2SO4 + 3H2O
  2. [Ref.1aster]
    CrO3 + 2HCl → CrO2Cl2 + H2O

Reactions:

  1. [Ref.1aster]
    CrO2Cl2 + 2HBr → CrO2Br2 + 2HCl

Permittivity (dielectric constant):

2.6 (20°C)

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

-570.3 (l)

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

-528.9 (g)

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

330 (g)

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

84 (g)

Enthalpy (heat) of vaporization at boiling point ΔvapH (kJ/mol)

35.1 (l) [Ref.]

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-59
  2. Chemical Reviews. - 1958. - Vol. 58, No. 1. - pp. 1-61 [DOI: 10.1021/cr50019a001]
  3. Реми Г. Курс неорганической химии. - Т.2. - М., 1966. - pp. 176-177 [Russian]
  4. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 244-245 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru