A mixture of \( \mathrm{FeO} \) and \( \mathrm{Fe}_{3} \mathrm{O}_{4} \), when heated in air to ...

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A mixture of \( \mathrm{FeO} \) and \( \mathrm{Fe}_{3} \mathrm{O}_{4} \), when heated in air to constant mass, gains \( 5 \% \) in its mass. Find out composition of mixture.
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