Chemistry - Solid State Question with Solution | TestHub

The mass of one unit cell is given by the product of its density and volume, which is $\rho a^3$.

Mass of one unit cell $=7.2\times 10^{-22}$ g

Total mass of the metal $=10.8$ g

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

Number of unit cells $=\frac{10.8}{7.2\times 10^{-22}}$

Number of unit cells $=1.5\times 10^{22}$

Answer: $1.5\times 10^{22}$