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

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Solution

In FeO crystals some Fe2+ cations are replaced by Fe3+ ions. Two Fe3+ ions replaces two Fe2+ ions to make up for the loss of positive charge. Due to this there is less amount of metal as compared to stoichiometric proportion.

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

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A mixture of FeO and FeO₃ when heated in air to constant weight gains 5% in weight. Find out composition of mixture.

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