Calculate the number of unit cells in $0.79 \ g$ of a metal if the product of the density and the volume of the unit cell is $1.58 \times 10^{-22} \ g$.
- A$3.96 \times 10^{21}$
- B$1.72 \times 10^{21}$
- C$4.46 \times 10^{21}$
- D$5.0 \times 10^{21}$
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