Synonyms
Chromium(6+) trioxide; Chrome (trioxyde de) [French]; I14-18129; Chromium trioxide, anhydrous; UN1463; Epitope ID:158535; Chromium trioxide solution in sulfuric acid; Monochromium trioxide; AC1L24SL; Chromium trioxide, anhydrous [UN1463] [Oxidizer];
IUPAC Name
trioxochromium;
Molecular Weight
99.993g/mol
Molecular Formula
CrO3;CrO3;CrO3;
Canonical SMILES
O=[Cr](=O)=O;
InChI
InChI=1S/Cr.3O;
InChI Key
WGLPBDUCMAPZCE-UHFFFAOYSA-N;
Melting Point
385 ° F (NTP, 1992);197 deg C;197 °C;387°F (Decomposes);
Density
2.7 (NTP, 1992);2.70;2.7 g/cm³;2.70 (CrO3);
Solubility
Very soluble (NTP, 1992);In water, 169 g/100 g water at 25 deg C;In water, 1667 g/L (EU Method A.6 (Water Solubility));In water, 167.299 lb/100 lb water at 70 deg F;Soluble in ethyl alcohol, ethyl ether, sulfuric and nitric acids;Soluble in sulfuric acid and organic solvents;Chromium(VI) oxide dissolves in water to form chromic acids; the solubility depends only slightly on temperature. A saturated solution contains 166 g of CrO3 at 20 deg C and 199 g of CrO3 at 90 deg C per 100 mL of water.;Solubility in water, g/100ml: 61.7 (good);63%;
Color Form
Dark red, bipyramidal prismatic crystals, flakes or granular powder;Brown solid;Flake, ground powder form;Dark-red ... flakes or powder [Note: Often used in an aqueous solution (H2CrO4)];
Complexity
61.8
Covalently-Bonded Unit Count
1
Decomposition
Decomposes when heated to 250 deg C, liberating oxygen to support combustion.;Decomposes at 250 deg C to chromic oxide and oxygen;Decomposes at 250 deg C with release of oxygen;250 °C;
EC Number
215-607-8
Exact Mass
99.925g/mol
H-Bond Acceptor
3
Heavy Atom Count
4
ICSC Number
1194
Monoisotopic Mass
99.925g/mol
Odor
Odorless;
Other Experimental
Chromium trioxide, CrO3, contains hexavalent chromium. Its molecular weight is 100.01. It is also known as red oxide of chromium, chromic anhydride, chromic acid anhydride and, erroneously, chromic acid.;Solubility in water, 61.7 g/100 cc solution at 0 deg C; 67.45 g/100 cc solution at 100 deg C;Heat of fusion: 37.7 cal/g;Deliquescent;Hexavalent chromium is linked to oxygen and is a powerful oxidizer, but it does not form coordination compounds, and is easily reduced to chromium trioxide. /Hexavalent chromium/;Melts at 198 deg C and starts to decompose, giving off oxygen and brownish red vapors with a pungent smell. The rate of decomposition reaches a maximum at 290 deg C, chromium(III) oxide, Cr2O3, being produced as the final product via various intermediate stages.;Enthalpy of formation: -594.5 kJ/mol;Powerful oxidizer; oxidizes alcohol and most other organic substances, sometimes with dangerous violence.;... hexavalent chromium compounds are acidic;
RTECS Number
GB6650000
Stability
Stable under recommended storage conditions.;Trivalent chromium is the most stable oxidation state and hexavalent chromium is the second most stable state. /Trivalent and hexavalent chromium/;
Topological Polar Surface Area
51.2A^2
UN Number
1463
Vapor Pressure
Very low (NIOSH, 2016);Very low;Very low;
