Question

How many unit cells are present in the 39 gram of potassium that crystallizes in the bcc

Answer 1

Atomic mass of potassium is 39 g.

In a BCC unit cell, there are 8 atoms at the corner of

a cube and 1 atom at the centre. Number of atom per unit cell =

8x1/8+1x1=

Number of atoms in 4.0 g of potassium = 4/39 x 6.02

x10

Number of unit cells in 4.0

of potassium = 4/39 x 6.02 x 1023/2 =3.09 x 10% unit cells