- Dichlorine monoxide
Dichlorine monoxide Identifiers CAS number PubChem ChemSpider ChEBI Jmol-3D images Image 1 Properties Molecular formula Cl2O Molar mass 86.9054 g/mol Melting point
−120.6 °C, 153 K, -185 °F
2.2 °C, 275 K, 36 °F
Solubility in water very soluble, hydrolyses 143g Cl2O per 100g water Solubility in other solvents soluble in CCl4 Structure Dipole moment 0.78 ± 0.08 D Thermochemistry Std enthalpy of
o298 +80.3 kJ mol−1 Standard molar
o298 265.9 J K−1 mol−1 Hazards NFPA 704 Related compounds Related oxides H2O
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Dichlorine monoxide, Cl2O, also known as, oxygen dichloride, dichlorine oxide or chlorine(I) oxide is a chlorine oxide. It is a brownish yellow gas at room temperature which can explode in high concentrations when heated or sparked.
It is best prepared by treating fresh yellow mercury(II) oxide with Cl2 gas:
- 2 Cl2 + 2 HgO → HgCl2·HgO + Cl2O
It can also be prepared by reaction of Cl2 gas with moist sodium carbonate, Na2CO3. Dichlorine monoxide is very water soluble and is the anhydride of hypochlorous acid. The equilibrium between HOCl and Cl2O in water is reversible
- 2HOCl <> Cl2O + H2O K(0°C) =3.55x10-3dm3mol-1
The shape of dichlorine monoxide is bent, due to the two lone pairs of electrons orbiting the nucleus that are not used to bond with the chlorine atoms on the oxygen atom.
It contains 42 electrons. 17 electrons of Cl x2 and 8 electrons of O x 1.
- ^ a b Inorganic chemistry , Egon Wiberg, Nils Wiberg, Arnold Frederick Holleman , "Dichlorine oxide" p.459 , section 5.3.1 google books link
- ^ N. N. Greenwood and A. Earnshaw, "Chemistry of the Elements", 2006 Butterworth-Heinemann
- ^ Inorganic chemistry , Egon Wiberg, Nils Wiberg, Arnold Frederick Holleman , "Hypochlorous acid" p.442 , section 4.3.1
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