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 6993600000000000000♠0.6 ppm o the atmosphere.

Ozone

Names
IUPAC name Trioxygen
Identifiers
CAS Nummer	10028-15-6 Y
3D model (JSmol)	Interactive eemage Interactive eemage
ChEBI	CHEBI:25812 Y
ChemSpider	23208 Y
EC Nummer	233–069–2
Gmelin Reference	1101
IUPHAR/BPS	6297
MeSH	Ozone
PubChem CID	24823
RTECS nummer	RS8225000
UNII	66H7ZZK23N Y
InChI InChI=1S/O3/c1-3-2 Y Key: CBENFWSGALASAD-UHFFFAOYSA-N Y InChI=1/O3/c1-3-2 Key: CBENFWSGALASAD-UHFFFAOYAY
SMILES [O-][O+]=O [O-][O+][O-]
Properties
Chemical formula	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	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	O Xi
NFPA 704	0 2 4 OX
Lethal dose or concentration (LD, LC):
LCLo (Lawest published)	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).
Y verify (whit is YN ?)
Infobox references