Show that the atom density of an element is given by N = ?N A /M where N A is Avogadro’s number…

Show that the atom density of an element is given by N
= _NA/M where NA is Avogadro’s number
(6.023E23) and M is the molecular weight. Find the atom density of C-12. Use
the data for scattering and absorption cross sections and find the total
macroscopic cross section of C-12. Since the mean free path is _ =
1/_, show that C-12 is an excellent moderator.