Chromium trioxide

Chromium trioxide
	Chromium, Cr Oxygen, O
Names
	IUPAC name Chromium trioxide
	Other names Chromic anhydride, Chromium(VI) oxide, Chromic acid (misnomer)
Identifiers
CAS Number	1333-82-0 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:48240 ;
ChemSpider	14212 ;
ECHA InfoCard	100.014.189
PubChem CID	14915;
RTECS number	GB6650000;
UNII	8LV49809UC ;
UN number	1463
CompTox Dashboard (EPA)	DTXSID0040125 ;
	InChI InChI=1S/Cr.3O Key: WGLPBDUCMAPZCE-UHFFFAOYSA-N ; InChI=1/Cr.3O/rCrO3/c2-1(3)4 Key: WGLPBDUCMAPZCE-YFSAMUSXAF;
	SMILES O=[Cr](=O)=O;
Properties
Chemical formula	CrO3
Molar mass	99.993 g·mol−1
Appearance	Dark red granular solid, deliquescent
Odor	Odorless
Density	2.7 g/cm3 (20 °C)
Melting point	197 °C (387 °F; 470 K)
Boiling point	250 °C (482 °F; 523 K) ; decomposes
Solubility in water	164.8 g/(100 mL) (0 °C); 169 g/(100 mL) (25 °C); 172.6 g/(100 mL) (40 °C); 198.1 g/(100 mL) (100 °C);
Solubility	Soluble in H2SO4, HNO3, (CH3CH2)2O, CH3COOH, (CH3)2CO
Magnetic susceptibility (χ)	+40·10−6 cm3/mol
Thermochemistry
Std molar; entropy (S⦵298)	73.2 J/(mol·K)
Std enthalpy of; formation (ΔfH⦵298)	−589.3 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H271, H301+H311, H314, H317, H330, H334, H335, H340, H350, H361f, H372, H410
Precautionary statements	P210, P260, P280, P303+P361+P353, P304+P340+P310, P305+P351+P338
NFPA 704 (fire diamond)	4 0 2 OX
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	80 mg/kg (rats, oral)
Safety data sheet (SDS)	ICSC 1194
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Chromium trioxide (also known as chromium(VI) oxide or chromic anhydride) is the inorganic compound with the formula CrO₃. It is the acidic anhydride of chromic acid, and is sometimes marketed under the same name.

This compound is a dark-purple solid. Millions of kilograms are produced annually, mainly for electroplating. Chromium trioxide is a powerful oxidiser, a mutagen, and a carcinogen.