An element crystallises in $fcc$ type of unit cell. The volume of one unit cell is $24.99 \times 10^{-24} \ cm^{3}$ and density of the element is $7.2 \ g \ cm^{-3}$. Calculate the number of unit cells in $36 \ g$ of a pure sample of the element.
- A$2.0 \times 10^{23}$
- B$2.0 \times 10^{21}$
- C$2.0 \times 10^{24}$
- D$1.25 \times 10^{21}$
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