Iron has a body centred cubic unit cell with a cell dimension of 286.65 pm. The density of iron is 7.874 g cm-3. Use this information to calculate Avogadro's number.
(At. mass of Fe = 55.845 u)
Formula : d =
For bcc, lattice Z = 2 [bcc = body centred cubic]
7.874 g cm-3 =
Avogadro's number, NA = 6.021023 mol-1