An oxide \( \left(\mathrm{Fe}_{2} \mathrm{O}_{\mathrm{n}}\right) \) of iron contains \( 70 \% \)...

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An oxide \( \left(\mathrm{Fe}_{2} \mathrm{O}_{\mathrm{n}}\right) \) of iron contains \( 70 \% \) iron by mass. Calculate value of \( n \).
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