Question

When it says Lithium crystallizes in a body centered cubic unit cell. what is the mass of one unit cell....

I did my math, but it says I have to multiply by 2. I am confused in why I have to do that?

I also have trouble understanding what is a body-centered cubic cell.

Answer 1

The solution to this problem is:

2 x 6.94 g divided by (6.02*10^23)
= 2.30*10^-23

Therefore,
(6.94^2)/(6.02 x10^23)
=2.30 x 10^-23
The answer is 2.30 x 10^-23.