Ozone
From Wikipedia, the free encyclopedia
| Ozone | |
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| IUPAC name | Trioxygen |
| Identifiers | |
| CAS number | |
| PubChem | |
| EC number | 233-069-2 |
| MeSH | |
| ChEBI | CHEBI:25812 |
| RTECS number | RS8225000 |
| SMILES | o:o:o |
| Gmelin Reference | 1101 |
| Properties | |
| Molecular formula | O3 |
| Molar mass | 47.98 g mol-1 |
| Appearance | Pale, blue gas |
| Density | 0.002144 g cm-3 (at 0 °C) |
| Melting point |
-192 °C, 81 K, -314 °F |
| Boiling point |
-112 °C, 161 K, -170 °F |
| Solubility in water | 1.05 g dm-3 (at 0 °C) |
| Refractive index (nD) | 1.2226 (liquid) |
| Structure | |
| Space group | C2v |
| Coordination geometry |
Digonal |
| Molecular shape | Dihedral |
| Hybridisation | sp2 for O1 |
| Dipole moment | 0.53 D |
| Thermochemistry | |
| Std enthalpy of formation ΔfH |
142.67 kJ mol−1 |
| Standard molar entropy S |
238.92 J K−1 mol−1 |
| Hazards | |
| EU classification |  O |
| NFPA 704 |
0
4
4
OX
|
| Related compounds | |
| Related compounds | Sulfur dioxide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Ozone is a chemical with the symbol O3. This means one molecule of Ozone is made of 3 Oxygen atoms. Ozone is important to planet Earth as it soaks up or absorbs the dangerous ultraviolet radiation from the Sun, like a kind of sun screen. Without this ozone layer things would not have been able to live on the surface of our planet.
Ozone is toxic if breathed in. It irritates the eyes and respiratory system. For a 15-minute exposure, the concentration in the atmosphere should not exceed 0.4 mg/m3. Ozone is also called trioxygen.
