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Aluminium crystallises in a cubic close ...

Aluminium crystallises in a cubic close packed structure. Its metallic radius is 125 pm.
How many unit cells are there in 100 `"cm"^(3)` of aluminium ?

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Volume of one unit cell `a^3=(354pm)^3`
`=(354xx10^(-10)cm)^3=44174155xx10^(-30)"CC"`
No.of unit cells in 100 cc of a metal `=(1("CC"))/(44174155xx10^(-30)("CC"))=2.26xx10^(22)`
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