Question

Iron has a body centred cubic unit cell with a cell dimension of 286.65 pm.

Answer 1

Solution :

For bee Z= 2

d=7.874gcm−3d=7.874gcm−3

a=286.65pm×10−10cma=286.65pm×10−10cm

M=55.845uM=55.845u

we know

density ,d=ZmNA.a3d=ZmNA.a3

So

Avogadro's number NA=Zmd.a3NA=Zmd.a3

=2×55.8457.874×(286.65×10−10)3=2×55.8457.874×(286.65×10−10)3

=6.02×1023