A compound forms 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

Number of constituent particles in 0.5 mol compound
`=0.5xx6.022xx10^(23)=3.011xx10^(23)`
Number of octahedral voids in the close packed structure
= Number of packed particles = `3.011xx10^(23)`
Number of tetrahedral voids in the close-packed structure
= 2 `xx` Number of packed particles
`=2xx3.011xx10^(23)=6.022xx10^(23)`
`therefore` Total number of voids = `3.011xx10^(23)+6.022xx10^(23)`
`=9.033xx10^(23)`