Calculate the volume of the unit cell if an element having a molar mass of $180 \ g \ mol^{-1}$ forms an $fcc$ unit cell. $\left[\rho \cdot N_{A} = 120 \times 10^{21} \ g \ cm^{-3} \ mol^{-1}\right]$
- A$6.00 \times 10^{-21} \ cm^3$
- B$5.00 \times 10^{-21} \ cm^3$
- C$4.00 \times 10^{-21} \ cm^3$
- D$7.00 \times 10^{-21} \ cm^3$
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