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?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Mole Concept concept. You can view video lessons to learn Mole Concept. Or if you need more Mole Concept practice, you can also practice Mole Concept practice problems.