Chemistry - Solid State Question with Solution | TestHub

Number of atoms in $0.8$ mol of the compound is given by $0.8\times N_A$.

Number of atoms $=0.8\times 6.022\times 10^{23}=4.8176\times 10^{23}$

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

Number of tetrahedral voids $=2\times 4.8176\times 10^{23}=9.6352\times 10^{23}$

Answer: $9.635\times 10^{23}$