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?

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

Total no. of voids in 0.5 mole of a compound forming hexagonal closed packed structure are :

What is the number of tetrahedral voids per atom in a crystal?

In the uint cell of a cubic close-packed struture, total number of voids is ……. Whereas in the unit cell of a hexagonal close-packed stucture, total number is voids is ……