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Names | |||
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IUPAC name
Trioxygen
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Identifiers | |||
CAS Nummer
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3D model (JSmol)
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ChEBI | |||
ChemSpider | |||
EC Nummer | 233–069–2 | ||
Gmelin Reference | 1101 | ||
IUPHAR/BPS
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MeSH | Ozone | ||
PubChem CID
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RTECS nummer | RS8225000 | ||
UNII | |||
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SMILES
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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 | ||
Solubility in watter
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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 | ||
Coordination geometry
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Digonal | ||
Molecular shape | Dihedral | ||
Hybridisation | sp2 for O1 | ||
Dipole moment
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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 | ![]() ![]() | ||
NFPA 704 | ![]()
0
2
4 OX | ||
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). | |||
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Infobox references | |||
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 o the atmosphere.
0.6 ppm