Question

How many atoms are in 0.750 moles of zinc?

Answer 1

(doesn't really matter that it's zinc :) )
It is $0.75*N_A$, where $N_A=6.023*10^{23}$ (in some books 6.022).

Answer 2

4.52 X 10²³ atoms

Use Avogadro's number to multiply 0.750 moles times 6.022 X 10²³ atoms.

Then divide by 1 atom to get the answer. hope that helped