Ferrous Oxide

Title: Ferrous Oxide
CAS Registry Number: 1345-25-1
Molecular Formula: FeO
Molecular Weight: 71.84
Percent Composition: Fe 77.74%, O 22.27%
Literature References: Prepn: Lux in Handbook of Preparative Inorganic Chemistry vol. 2, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) p 1497.
Properties: Jet-black powder. mp 1360°; d 5.7. Easily oxidized by air. It is a strong base and readily absorbs CO2. Practically insol in water and alkalies. Readily sol in acids.
Melting point: mp 1360°
Density: d 5.7
Use: In manuf of green, heat-absorbing glass; in steel manuf; in enamels; as catalyst.
Ferrous Phosphate Ferrous Phosphide Ferrous Selenide Ferrous Succinate Ferrous Sulfate

Iron(II) oxide
Iron(II) oxide
CAS number 1345-25-1 YesY
PubChem 14945
ChemSpider 14237 YesY
UNII G7036X8B5H YesY
ChEBI CHEBI:50820 YesY
Jmol-3D images Image 1
Molecular formula FeO
Molar mass 71.844 g/mol
Appearance black crystals
Density 5.745 g/cm3
Melting point 1,377 °C; 2,511 °F; 1,650 K ([1])
Boiling point 3,414 °C; 6,177 °F; 3,687 K
Solubility in water Insoluble
Solubility insoluble in alkali, alcohol
dissolves in acid
Refractive index (nD) 2.23
EU Index Not listed
Main hazards can be pyrophoric
NFPA 704
NFPA 704.svg
Autoignition temperature variable
Related compounds
Other anions iron(II) fluoride, iron(II) sulfide, iron(II) selenide, iron(II) telluride
Other cations manganese(II) oxide, cobalt(II) oxide
Related compounds Iron(III) oxide, Iron(II,III) oxide
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Iron(II) oxide, also known by its former name ferrous oxide or informally as iron monoxide, is one of the iron oxides. It is a black-colored powder with the chemical formula FeO. It consists of the chemical element iron in the oxidation state of 2 bonded to oxygen. Its mineral form is known as wüstite. Iron(II) oxide should not be confused with rust, which usually consists of hydrated iron(III) oxide (ferric oxide). The term may be used more loosely for a non-stoichiometric compound as the ratio of the elements iron and oxygen can vary; samples are typically iron deficient with compositions ranging from Fe0.84O to Fe0.95O.[2]