Chemistry - Solid State Question with Solution | TestHub

$\begin{array}{rl}& \text{ Mass of an atom }=\frac{56}{6.02\times 10^{23}}\mathrm{g}\\ & \text{ Mass of unit cell }=\frac{2\times 56}{6.02\times 10^{23}}\\ & =18.6\times 10^{-23}\\ & \text{ or }1.86\times 10^{-22}\mathrm{g}\end{array}$