Sodium crystallizes in i bcc unit cell. CaICulate the approximate no. of unit cells in 9.2 grams of sodium. (Atomic mass of Na = 23 u).

Explanation

I mol of Sodium = 23 gm.
23. gm of Sodium contain `=6.02xx10^(23)` sodium atoms
I gm of Sodium contafo `=(6.02xx10^(23))/23` sodium atoms
9 .2 gm of Sodium contain `=(6.02xx10^(23))/23xx9.2 2.4xx10^(23)` sodium atoms
One umt cell of bee contam 2 atoms. So no of umt cells `=(2.4xx10^(23))/2=1.2xx10^(23)` umt cells.