Question

how many atoms are in 0.750 moles of zinc

Answer 1

Ifwe have 0.750 moles of Zn, we can use the next formula
n = N/N_A
where
n - amount of substance;
N- amount of atoms
N_A - the Avogadro constant
N(Zn) = n * N_A;
N(Zn) = 0.750 moles * 6.02*10^23 = 4.515 10^23 atoms

Answer: 4.515 10^23 atoms