Calculate the mass of 1 atom of oxygen, if 1 mole of oxygen atom weighs 16 g.
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You are thoroughly confused. One mole (not one molecule) of oxygen atoms would weigh 16 g, because an oxygen atom weighs 16 u.
To get the mass of an oxygen atom in grams, you’d divide 16 g/mol (well actually 15.999) by Avogadro’s number, 6.022×10²³ /mol.
You would get 2.657×10^−23 g, or 2.657×10^−26 kg.
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