Question

Number of unit cells in 4 g of X(at.mass = 40) which crystallises in bcc pattern is (NA = Avogadro number)

Answer 1

Answer:

1) 4g of X=$\frac{4}{40} mole$

=0.1mole

=0.1*$N_{A}$atoms

2)One bcc unit cell has 2 atoms, therefore, no. of unit cells in

0.1$N_{A}$atoms=$\frac{0.1N_{A} }{2}$