Question

An element crystallizes into a structure which may be described by a cubic unit cell having one atom at each corner of the cube and two atoms at one of its body diagonals. If the volume of the unit cell is 24 x 10-24 cc and density is 7.2 g / cc. Calculate the number of atoms present in 200 g element.

Answer 1

No. of atoms = 1 + 2 = 3

No. of atoms in 200 g = (Mass / Molar Mass) x NA

= 3.47 x 1024.