Question

A compound contains x atoms at the corner and y atoms occupy all the tetrahedral voids. Write the simplest formula of the compound

Answer 1

Explanation:

Number of tetrahedral voids formed = 2×Number of atoms of element Y

Number of atoms of element Y in the ccp unit cell = 4

Number of tetrahedral voids formed = 2×4=8

Number of tetrahedral voids occupied by atoms of X =

3

1

×8

Ratio of the numbers of atoms of X and Y =

3

8

:4=2:3

Hence, the formula of the compound is X

2

Y

3