Chemistry - Solid State Question with Solution | TestHub

Mass of one unit cell is given by the product of its density and volume.

Mass of one unit cell $=d\times a^3=1.58\times 10^{-22}\mathrm{g}$

Total mass of the metal $=0.79\mathrm{g}$

Number of unit cells $=\frac{\text{Total mass}}{\text{Mass of one unit cell}}$

Number of unit cells $=\frac{0.79}{1.58\times 10^{-22}}$

Number of unit cells $=0.5\times 10^{22}=5.0\times 10^{21}$

Answer: $5.0\times 10^{21}$