What is the formula of a compound in which the element Y forms ccp lattice and atoms X occupy 1/3rd of tetrahedral voids.

What is the formula of a compound in which the element Y forms ccp lat

1.	What is the formula of a compound in which the element Y forms ccp lattice and atoms X occupy 1/3rd of tetrahedral voids.
Answer» Solution :Suppose no. of ATOMS Y present in the packing =n Then, TETRAHEDRAL voids = 2n Atoms X present in the tetrahedral voids=`1/3xx2n ="2n"/3` `THEREFORE` Ratio of X:Y =`"2n"/3:n=2/3:1=2:3` Hence, the FORMULA is `X_2Y_3`