In a compound, nitrogen atoms (N) make cubic close packed lattic and metal atoms (M) occupy one-third of the tetrahedral voids present. Determine the formula of the compound formed by M and N?

 

 
Let the number of N atoms in ccp is x
 
 Number of tetrahedral voids = 2x
 Numberof M atoms = 13 x 2x
    Number of N atoms  Number of M atoms =3x2x=32
 
So, the formula of the compound is M2N3