Number of unit cell in 8 g of X (atomic mass =40) which crystallizes in bcc pattern is `(N_(A)`= Agogardro number)

Options

A. `0.5 Na_(A)`
B. `0.1 N_(A)`
C. `0.2 N_(A)`
D. `2N_(A)`

Answer

B

Explanation

8 g of `X=(8)/(40)=0.2"mole" =0.2xx N_(A)` atoms
One bcc unit cell has 2 atoms therefore number of unit cell in `0.2N_(A)` atom is `0.1N_(A)`.