Question

What was the ratio in the formula for Iron (II) oxide?

Answer 1

2:3 was the ratio.......

Answer 2

Iron(II) oxide or ferrous oxide is the inorganic compound with the formula FeO. Its mineral form is known as wüstite. One of several iron oxides, it is a black-colored powder that is sometimes confused with rust, the latter of which consists of hydrated iron(III) oxide(ferric oxide). Iron(II) oxide also refers to a family of related non-stoichiometric compounds, which are typically iron deficient with compositions ranging from Fe0.84O to Fe0.95O.[2]

Iron(II) oxideNamesIUPAC name

Iron(II) oxide

Other names

Ferrous oxide,iron monoxide

Identifiers

CAS Number

1345-25-1 

3D model (JSmol)

Interactive image

ChEBI

CHEBI:50820 

ChemSpider

14237 

ECHA InfoCard100.014.292

Gmelin Reference

13590

PubChem CID

14945

UNII

G7036X8B5H 

InChI

InChI=1S/Fe.O 

Key: UQSXHKLRYXJYBZ-UHFFFAOYSA-N 

InChI=1/Fe.O/rFeO/c1-2

Key: UQSXHKLRYXJYBZ-WPTVXXAFAB

SMILES

[Fe]=O

Properties

Chemical formula

FeOMolar mass71.844 g/molAppearanceblack crystalsDensity5.745 g/cm3Melting point1,377 °C (2,511 °F; 1,650 K)[1]Boiling point3,414 °C (6,177 °F; 3,687 K)

Solubility in water

InsolubleSolubilityinsoluble in alkali, alcohol 
dissolves in acid

Magnetic susceptibility (χ)

+7200·10−6 cm3/mol

Refractive index (nD)

2.23HazardsMain hazardscan be pyrophoricSafety data sheetICSC 0793NFPA 704



3

0

2

Autoignition
temperature

variableRelated 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