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The answer is it's Atomic Mass converted to grams...

Chlorine has an atomic mass of 35.45

So 1 mol of chlorine would be 35.45g

you have 142g of it, so you divide 142 by 35.45 and get 4.005 moles of chlorine

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Chlorine gas is a diatomic molecule Cl2. There are 6.00 mol of chlorine atoms in a sample of chlorine gas. How many moles of chlorine gas is this?

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