1. Understand the Relationship

* Avogadro's Number: One mole of any substance contains 6.022 x 10²³ particles (atoms, molecules, etc.).

2. Set up the Conversion

We'll use Avogadro's number as a conversion factor:

(9.02 x 10²³ atoms Cl) * (1 mole Cl / 6.022 x 10²³ atoms Cl) = 1.50 moles Cl

Therefore, there are 1.50 moles of chlorine gas in 9.02 x 10²³ atoms of chlorine.