A compound is formed hexagonal close-packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?

Explanation

An atom in hcp structure has three voids, one octahedral and two tetrahedral
No. of atoms in 0.5 mol = `0.5 xx 6.022 xx 10^(23)`
`= 3.011 xx 10^(23)`
Total number of voids = `3 xx 3.011 xx 10^(23)`
Number of tetrahedral voids = `2 xx 3.011 xx 10^(23)`
`=6.022 xx 10^(23)` .