Chemists defined a mole as the amount of atoms that are in exactly 12 grams of carbon-12, which is Avogadro’s number! Don’t worry – I was confused about this at first too but, trust me, it gets easier ...
one mole of carbon is 12 g and contains 6 × 10 23 atoms of carbon. The relative formula mass or water is 18. One mole of water weighs 18 grams and contains 6 × 10 23 molecules of water.
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