Iron(II) oxide crystal has a cubic structure and each edge of the unit cell is \( 0.493 \mathrm{...

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Iron(II) oxide crystal has a cubic structure and each edge of the unit cell is \( 0.493 \mathrm{~nm} \). If the density of the oxide as \( 4.0 \mathrm{~g} / \mathrm{cm}^{3} \), then the number of iron (II) oxide formula units in each unit cell is \( (\mathrm{Fe}=56) \)
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