[" Q3.A compound forms hcp "],[" structure.What is the total no "],[" of voids in "0.5" mole of it? "^(*)]

A compound forms hexagonal close packed structure. What is the total number of voids in 0.5 mol of it.

A compound forms hcp structure. What is the total number of voids in 0.5 mol of it ? How many of these are tetrahedral voids ?