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Properties of Chromium(III) oxide

Properties of Chromium(III) oxide (Cr2O3):

Compound NameChromium(III) oxide
Chemical FormulaCr2O3
Molar Mass151.9904 g/mol

Chemical structure
Cr2O3 (Chromium(III) oxide) - Chemical structure
Lewis structure
3D molecular structure
Physical properties
Appearancelight to dark green, fine crystals
Solubilityinsoluble
Density5.2200 g/cm³
Helium 0.0001786
Iridium 22.562
Melting2,435.00 °C
Helium -270.973
Hafnium carbide 3958
Boiling4,000.00 °C
Helium -268.928
Tungsten carbide 6000
Thermochemistry
Enthalpy of Formation-112.00 kJ/mol
Adipic acid -994.3
Tricarbon 820.06
Standard Entropy81.00 J/(mol·K)
Ruthenium(III) iodide -247
Chlordecone 764

Alternative Names

Chromium sesquioxide
Chromia
Chrome green
Eskolaite

Elemental composition of Cr2O3
ElementSymbolAtomic weightAtomsMass percent
ChromiumCr51.9961268.4202
OxygenO15.9994331.5798
Mass Percent CompositionAtomic Percent Composition
Cr: 68.42%O: 31.58%
Cr Chromium (68.42%)
O Oxygen (31.58%)
Cr: 40.00%O: 60.00%
Cr Chromium (40.00%)
O Oxygen (60.00%)
Mass Percent Composition
Cr: 68.42%O: 31.58%
Cr Chromium (68.42%)
O Oxygen (31.58%)
Atomic Percent Composition
Cr: 40.00%O: 60.00%
Cr Chromium (40.00%)
O Oxygen (60.00%)
Identifiers
CAS Number1308-38-9
SMILESO=[Cr]O[Cr]=O
Hill formulaCr2O3

Related compounds
FormulaCompound name
CrOChromium(II) oxide
CrO3Chromic acid
CrO2Chromium(IV) oxide
CrO5Chromium(VI) oxide peroxide
CrCrO4Chromium(II) chromate
CrCr2O7Chromium(II) dichromate
Cr2(O2)3Chromium(III) peroxide
Cr2(CrO4)3Chromium(III) chromate
Cr2(Cr2O7)3Chromium(III) dichromate

Sample reactions for Cr2O3
EquationReaction type
Al + Cr2O3 = Al2O3 + Crsingle replacement
Cr2O3 + Si = Cr + SiO2single replacement
Cr2O3 + H2 = Cr + H2Osingle replacement
Cr2O3 = Cr + O2decomposition
Cr2O3 + H2O = Cr(OH)3synthesis

Related
Molecular weight calculator
Oxidation state calculator

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