How many atoms are in 7.2 mol of chlorine? (Cl=35.5)

1. Number of atoms in 1 mole = 6.023 $\times$ 10²³

2. Number of atoms in 7.2 moles of Cl = 7.2 ​$\times$ 6.023 $\times$ 10²³ = 4.33 $\times$ 10²⁴.