An element `X (At,wt = 80 g//mol)` having fcc structure, calculate the number of unit cells in `8g of X`

Options

A. `0.4 N_(A)`
B. `0.025 N_(A)`
C. `4 N_(A)`
D. `0.2 N_(A)`

Answer

B

Explanation

4 atoms `to 1`unit cell
1 atoms`to(1)/(4)`unit cell
`0.1N_(A)` atom `to (0.1)/(4)N_(A)` unit cell
`to0.025N_(A)` unit cell