Question

Find the molecular formula of solid if X occupy corner of cube and Y occupies edge centre of cube?​

Answer 1

Answer:

A solid has a structure in which X atoms are located at cubic corners of a unit cell,

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Answer 2

in the given compound; there must be 8 corners in a cube,

So, as the Y atoms are at corners, so each of the Y atom will contribute 81 part towards a particular unit cell.

The no. of Y atoms per unit cell =8×81=1

Further, the X atoms are at the alternate faces so they will be available only at one of the opposite faces, so the contribution of each of the X-atoms will be 21 towards the face center.

The no. of X-atoms =2×21=1

Hence, the formula of the compound will be "XY" .