We need to determine the **number of Cl _{2} molecules **present in a

Recall that based on **Avogadro's number**, there are **6.022 x 10 ^{23} entities**

This means that for 1 mole of Cl_{2 }there are 6.022 x 10^{23 }molecules^{ }

We need to **s****olve for the # of moles for 39.2 g Cl_{2} **to

A sample of chlorine gas has a mass of 39.2 grams. How many Cl_{2} molecules are there in the sample?