The answer is a non-negative integer. Iron(II) oxide has a cubic structure and each unit cell ha...

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The answer is a non-negative integer.
Iron(II) oxide has a cubic structure and each unit cell has side \( 500 \mathrm{pm} \). If the density of the oxide is \( 4 \mathrm{~g} \mathrm{~cm}^{-3} \), the number of oxide ions present in each unit cell is . (Molar mass of \( \mathrm{FeO}=72 \mathrm{~g} \mathrm{~mol}^{-1}, N_{\mathrm{A}}=6.02 \times \)
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