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Iron (II) oxide has a cubic structure an...

Iron (II) oxide has a cubic structure and each unit cell has a size of `5 Å`. If density of this oxide is 4 g `cm^(-3)`, calculate the number of `Fe^(2+) and O^(2-)` ions present in each unit cell.
(Atomic mass of Fe = 56, O = 16, `N_(A) = 6.023 xx 10^(23) and 1 Å = 10^(-8)` cm)

Text Solution

Verified by Experts

Density = `Z xx M//a^(3) xx N_(A)`
`4 = (Z xx 72)//(5 xx 10^(-10))^(3) xx 6.023 xx 10^(23)`
So Z = 4.18
= 4
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