Ozone

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Ozone
Skeletal formula o ozone wi pairtial chairges shawn
Baw an stick model o ozone
Spacefill model o ozone
Names
IUPAC name
Trioxygen
Identifiers
Jmol-3D images Image
Image
ChEBI CHEBI:25812 YesY
ChemSpider 23208 YesY
ECHA InfoCard 100.030.051
EC Nummer 233–069–2
Gmelin Reference 1101
MeSH Ozone
RTECS nummer RS8225000
UNII 66H7ZZK23N YesY
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
Coordination
geometry
Digonal
Molecular shape Dihedral
Hybridisation sp2 for O1
Dipole moment 0.53 D
Thermochemistry
Staundart molar
entropy
So298
238.92 J K−1 mol−1
Std enthalpy o
formation
ΔfHo298
142.67 kJ mol−1
Hazards
EU clessification Oxidising agent O Very Toxic T+ Corrosive C Irritant Xi
NFPA 704
Flammability code 0: Will nae burn. E.g., watter Health code 4: Very short exposur could cause daith or major residual injury. E.g., VX gas Reactivity code 4: Readily capable o detonation or explosive decomposeetion at normal temperaturs an pressurs. E.g., nitroglycerin Special hazard OX: Oxidizer. E.g., potassium perchlorateNFPA 704 four-colored diamond
Lethal dose or concentration (LD, LC):
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 health exposure limits (NIOSH):
TWA 0.1 ppm (0.2 mg/m3)[1]
C 0.1 ppm (0.2 mg/m3)[1]
5 ppm[1]
Relatit compoonds
Relatit compoonds
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).
YesY verify (whit is YesYN ?)
Infobox references

Ozone (seestematically named 1,3λ1-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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