Calculate the number of unit cells in $10.8 \ g$ of metal,given that $\rho a^3 = 7.2 \times 10^{-22} \ g$.
- A$1.5 \times 10^{22}$
- B$3.0 \times 10^{22}$
- C$4.5 \times 10^{22}$
- D$6.0 \times 10^{22}$
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