Vanadium(III) oxide

Vanadium(III) oxide
Names
	Other names Vanadium sesquioxide; Vanadium trioxide; Vanadic oxide;
Identifiers
CAS Number	1314-34-7 ;
3D model (JSmol)	Interactive image;
ChemSpider	11575285;
ECHA InfoCard	100.013.847
PubChem CID	518710;
RTECS number	YW3050000;
UNII	Y469L16CWH ;
CompTox Dashboard (EPA)	DTXSID90892259 ;
	InChI InChI=1S/3O.2V Key: KFAFTZQGYMGWLU-UHFFFAOYSA-N;
	SMILES [O-2].[V+3].[O-2].[V+3].[O-2];
Properties
Chemical formula	V2O3
Molar mass	149.881 g/mol
Appearance	Black powder
Density	4.87 g/cm3
Melting point	1,940 °C (3,520 °F; 2,210 K)
Solubility in water	Insoluble
Solubility in acids	soluble with difficulty
Magnetic susceptibility (χ)	+1976.0·10−6 cm3/mol
Structure
Crystal structure	Corundum, hR30
Space group	R3c (No. 167)
Lattice constant	a = 547 pm α = 53.74°, β = 90°, γ = 90°
Thermochemistry
Std molar; entropy (S⦵298)	98.07 J/mol·K
Std enthalpy of; formation (ΔfH⦵298)	−1218.800 kJ/mol
Gibbs free energy (ΔfG⦵)	−1139.052 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H332, H335
Precautionary statements	P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P317, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501
	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

Vanadium(III) oxide is the inorganic compound with the chemical formula V₂O₃. It is a black basic oxide dissolving in acids to give solutions of vanadium(III) complexes. Upon exposure to air it gradually converts into indigo-blue VO₂. It occurs as the rare mineral karelianite.