What is the mass in grams of a single atom of chlorine ? (Atomic mass of chlorine = 35.5)

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Solution

One mole of chlorine atoms has a mass of $35.453 g$ . A mole of something means that you have $6.023 \times 10^{23}$ units of that something. So if you have a mole of $C l$ atoms you have $6.023 \times 10^{23}$ atoms of $C l$ . Since a mole of chlorine atoms has a mass of $35.453 g$ , then any single one of those atoms will have a mass equal to $5.720 \times 10^{23}$ grams per atom. $(35.453 g / m o l e \div 6.023 \times 10^{23} a t o m s / m o l e)$

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