0 20/30 Iron oxide shows non-stoichiometric defect. It can exist in the form Feo 950.
What is the percentage of Fet2 ion present in Feo.950?
15.5%
11.5%
89.5%
85%
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Analysis shows that FeO has a non-stoichiometric composition with formula Fe
0.95
O. In a stoichiometric composition of FeO, there will be one Fe
2+
ion for one O
2−
ion.
To maintain electrical neutrality, some Fe
2+
ions are missing from the crystal lattice. Hence, the number of ions of iron is less than the number of oxide ions.
The non - stoichiometry reflects the ease of oxidation of Fe
2+
to Fe
3+
effectively replacing a small portion ofFe
2+
with two thirds their number of Fe
3+
Thus for every "missing" Fe
2+
ions, the crystals contains two Fe
3+
ions to balance the charge. for example
3Fe
2+
= 2Fe
3+
to maintain electrical neutrality.
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