Ozone |
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200px |
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IUPAC name | Trioxygen |
Other names | 2λ4-trioxidiene; catena-trioxygen |
Identifiers |
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CAS number | 10028-15-6 |
PubChem | 24823 |
EC number | 233–069–2 |
MeSH | Ozone |
ChEBI | CHEBI:25812 |
RTECS number | RS8225000 |
SMILES | [O-][O+]=O |
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Gmelin Reference | 1101 |
Properties |
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Molecular formula | O3 |
Molar mass | 47.98 g mol-1 |
Appearance | Colourless to pale blue gas< |
Odor | Pungent |
Density | 2.144 mg cm−3 (at 0 °C) |
Melting point | -192 °C, 81 K, -314 °F |
Boiling point | |
Solubility in water | 1.05 g L−1 (at 0 °C) |
Solubility in other solvents | Very soluble in CCl4, sulfuric acid |
Vapor pressure | 55.7 atm (−12.15 °C or 10.13 °F; 261.00 K) |
| +6.7·10−6 cm3/mol |
Refractive index (nD) | 1.2226 (liquid), 1.00052 (gas, STP, 546 nm — note high dispersion) |
Structure |
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Space group | C2v |
Coordination geometry | Digonal |
Molecular shape | Dihedral |
Hybridisation | sp2 for O1 |
Dipole moment | 0.53 D |
Thermochemistry |
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Std enthalpy of formation ΔfHo298 | 142.67 kJ mol−1 |
Standard molar entropy So298 | 238.92 J K−1 mol−1 |
Hazards |
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NFPA 704 | |
U.S. Permissible exposure limit (PEL) | TWA 0.1 ppm (0.2 mg/m3) |
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |