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
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.030.051
EC Nummer 233–069–2
Gmelin Reference 1101
MeSH Ozone
RTECS nummer RS8225000
UNII
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
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
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 heal exposur leemits (NIOSH):
PEL (Permissible)
TWA 0.1 ppm (0.2 mg/m3)[1]
REL (Recommendit)
C 0.1 ppm (0.2 mg/m3)[1]
IDLH (Immediate danger)
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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