If mass of 1 molecule of water is 18 amu, what is the mass of 1 mole of water molecule ?
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6 x 10²³ nucleons have a mass of 1 gram → 1 MOL of water weights 18 gram. So: the mass of 1 water molecule = 18 a.m.u. = molecular mass (micro level) the mass of 1 MOL of water molecules = 18 grams = molar mass (macro level)
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