Problem: A sample of chlorine gas has a mass of 39.2 grams. How many  Cl2 molecules are there in the sample?

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We need to determine the number of Cl2 molecules present in a chlorine gas sample with a mass of 39.2 grams. 

Recall that based on Avogadro's number, there are 6.022 x 1023 entities for 1 mole of a substance. 

This means that for 1 mole of Clthere are 6.022 x 1023 molecules   

We need to solve for the # of moles for 39.2 g Cl2 to determine the number of Cl2 molecules

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Problem Details

A sample of chlorine gas has a mass of 39.2 grams. How many  Cl2 molecules are there in the sample?