Question

In a hypothetical crystal, each corner of a cube is occupied by oxygen(O2), each edge of the cube is occupied by sodium(Na) and centre of the cube is occupied by tungsten (W). Formula of the crystal compound is...​

Answer 1

Explanation:

answer : option (2) Na3WO

explanation : each corner of the cube is occupied by oxygen.

so, number of oxygen atoms in cube = number of corners × 1/8 [ corner atom is shared by eight atoms.]

= 8 × 1/8 = 1

each edge of the cube is occupied by sodium.

so, number of sodium atoms in cube = number of edges × 1/4 [ edge atom is shared by 4 atoms. ]

= 12 × 1/4 = 3

and centre of the cube is occupied by Tungsten.

so, number of tungsten atom in cube = 1

ratio of atoms in cube :

Na : W : O = 3 : 1 : 1

now, formula of compound will be ....

Na3WO