Calculate the number of unit cells in $0.9 \ g$ of a metal if it forms a $bcc$ structure. Given: $\rho \times a^3 = 3 \times 10^{-22} \ g$.
- A$1.0 \times 10^{21}$
- B$2.0 \times 10^{21}$
- C$3.0 \times 10^{21}$
- D$4.0 \times 10^{21}$
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