Chemistry - Solid State Question with Solution | TestHub

In HCP structure For each atom total three voids are present (one octahedral and two tetrahedral) Number of atoms in $1\mathrm{mol}$ of compound $=6.022\times 10^{23}$ Total number of voids $=$ No. of atoms $\times 3$ $$\begin{array}{rl}& =6.022\times 10^{23}\times 23\\ & =18.06\times 10^{23}\\ & =1.806\times 10^{24}\end{array}$$