Question

How many atoms are in 0.00125 moles of zinc

Answer 1

Each mole has $6.022 *10^{23}$ atoms.
$\frac{1}{8}* 10^{-2}*6.022* 10^{23} = 7.5* 10^{20}$ atoms

Answer 2

One mole of anything is 6.022*10^23 of that thing. so just multiply 6.022*10^23 by 0.00125 to find your answer.