Why FeO in non-stochiometric with the formula `Fe_(0.95)O` ?

1.	Why FeO in non-stochiometric with the formula `Fe_(0.95)O` ?
Answer» Some `Fe^(2+)` ions are rpelaced by ` Fe^(3+) ` ions :` 3 Fe^(2+) -= 2 Fe^(3+)` to maintain electrical neutrality

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Why FeO in non-stochiometric with the formula `Fe_(0.95)O` ?

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