Q. 585.0( 1 Vote )

Why is FeO (s) not formed in stoichiometric composition?

Answer :

Iron(II) oxide or ferrous oxide is the inorganic compound with the formula FeO. This compound also refers to a family of related non-stoichiometric compounds, which are typically iron deficient with compositions ranging from Fe0.84O to Fe0.95O. This happens because of metal deficiency defect, a non-stoichiometric defect. In crystals of FeO, some Fe2+ cations are missing and the loss of positive charge is made up by the presence of required number of Fe3+ ions. Three Fe2+ ions are replaced by two Fe3+ ions to make up for the loss of positive charge. Hence, FeO is not formed in stoichiometric composition.


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