The number of octahedral void$(s)$ per atom present in a cubic close-packed structure is

What is the number of octahedral voids present in $0.2 \ mol$ of a compound forming $hcp$ structure?

The molecular formula of a crystalline solid is $X_3Y_2$. Atoms of $Y$ form $ccp$ lattice,and atoms of $X$ occupy $50\%$ octahedral voids and $x\%$ of tetrahedral voids. What is the percentage of unoccupied tetrahedral voids?

In a crystal lattice,anions $A$ form an $hcp$ array,and $2/3$ of the tetrahedral voids are occupied by cations $C$. What is the formula of the crystal?

Explain the Hexagonal Close Packing $(hcp)$ and Cubic Close Packing $(ccp)$ or Face-Centered Cubic $(fcc)$ structures.

In a cubic close packed structure,the fractional contributions of an atom at the corner and at the face in the unit cell are,respectively: