Ozone
Ozone (seestematically named 1λ1,3λ1-trioxidane an catena-trioxygen), or trioxygen, is an inorganic molecule wi the chemical formula O
3. It is a pale blue gas wi a distinctively pungent smell. It is an allotrope o oxygen that is much less stable nor the diatomic allotrope O
2, breakin doun in the lawer atmosphere tae normal dioxygen. Ozone is formed frae dioxygen bi the action o ultraviolet licht an an aa atmospheric electrical discharges, an is present in law concentrations throuoot the Yird's atmosphere (stratosphere). In tot, ozone maks up anly 0.6 ppm o the atmosphere.
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| Names | |||
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| IUPAC name
Trioxygen
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| Identifiers | |||
3D model (JSmol)
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| ChEBI | |||
| ChemSpider | |||
| EC Nummer | 233–069–2 | ||
| Gmelin Reference | 1101 | ||
| MeSH | Ozone | ||
PubChem CID
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| RTECS nummer | RS8225000 | ||
| UNII | |||
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| Properties | |||
| O3 | |||
| Molar mass | 48.00 g·mol−1 | ||
| Appearance | colourless tae pale blue gas[1] | ||
| Odour | pungent[1] | ||
| Density | 2.144 mg cm−3 (at 0 °C) | ||
| Meltin pynt | −192.2 °C; −313.9 °F; 81.0 K | ||
| Bylin pynt | −112 °C; −170 °F; 161 K | ||
| 1.05 g L−1 (at 0 °C) | |||
| Solubility | very soluble in CCl4, sulfuric acid | ||
| Vapour pressur | >1 atm (20 °C)[1] | ||
| Refractive index (nD) | 1.2226 (liquid), 1.00052 (gas, STP, 546 nm — note heich dispersion)[2] | ||
| Structur | |||
| Space group | C2v | ||
| Digonal | |||
| Molecular shape | Dihedral | ||
| Hybridisation | sp2 for O1 | ||
| 0.53 D | |||
| Thermochemistry | |||
| Staundart molar entropy S |
238.92 J K−1 mol−1 | ||
| Std enthalpy o formation ΔfH |
142.67 kJ mol−1 | ||
| Hazards | |||
| EU clessification |  O Xi
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| NFPA 704 | |||
| Lethal dose or concentration (LD, LC): | |||
LCLo (Lawest published)
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12.6 ppm (mouse, 3 hr) 50 ppm (human, 30 min) 36 ppm (rabbit, 3 hr) 21 ppm (mouse, 3 hr) 21.8 ppm (rat, 3 hr) 24.8 ppm (guinea pig, 3 hr) 4.8 ppm (rat, 4 hr)[3] | ||
| US heal exposur leemits (NIOSH): | |||
PEL (Permissible)
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TWA 0.1 ppm (0.2 mg/m3)[1] | ||
REL (Recommendit)
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C 0.1 ppm (0.2 mg/m3)[1] | ||
IDLH (Immediate danger)
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5 ppm[1] | ||
| Relatit compoonds | |||
Relatit compoonds
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Sulfur dioxide Trisulfur Disulfur monoxide Cyclic ozone | ||
Except whaur itherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa). | |||
 verify (whit is   ?)
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| Infobox references | |||
References
eedit- ↑ a b c d e f NIOSH Pocket Guide tae Chemical Hazards 0476
- ↑ Cuthbertson, Clive; Cuthbertson, Maude (1914). "On the Refraction and Dispersion of the Halogens, Halogen Acids, Ozone, Steam Oxides of Nitrogen, and Ammonia". Philosophical Transactions of the Royal Society A. 213: 1–26. Bibcode:1914RSPTA.213....1C. doi:10.1098/rsta.1914.0001. Retrieved 4 Februar 2016.
- ↑ "Ozone". Immediately Dangerous to Life and Health. National Institute for Occupational Safety and Health (NIOSH).