$A$ metal has a cubic lattice of side length $2.88 \, \mathring{A}$. The density of the metal is $7.2 \, g/cm^3$. How many unit cells are present in $7.2 \, mg$ of the metal?
- A$4.19 \times 10^{19}$
- B$41.9 \times 10^{19}$
- C$41.9 \times 10^{20}$
- DNone of these
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