Chemistry - Solid State Question with Solution | TestHub

Number of atoms in $0.6$ mole of the compound is given by $N=0.6\times N_A$.

Substituting $N_A=6.022\times 10^{23}$ mol${}^{-1}$:

$N=0.6\times 6.022\times 10^{23}=3.6132\times 10^{23}$

In a close-packed structure (hcp), the number of tetrahedral voids is twice the number of atoms.

Number of tetrahedral voids $=2N$

$=2\times 3.6132\times 10^{23}=7.2264\times 10^{23}$

Answer: $7.2264\times 10^{23}$