$A$ metal crystallizes in a $bcc$ unit cell having unit cell volume $2.5 \times 10^{-23} \text{ cm}^3$. Find the number of unit cells in $18 \text{ g}$ of the metal if the density of the metal is $7.2 \text{ g cm}^{-3}$.
- A$1.0 \times 10^{23}$
- B$2.0 \times 10^{23}$
- C$0.5 \times 10^{23}$
- D$1.5 \times 10^{23}$
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