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The molar mass of water in liquid form is 18.02 g/mol, where hydrogen has a molecular mass of 1.01 g/mol and oxygen has 16 g/mol. Therefore, 2.02 + 16 = 18.02 g/mol. Molar mass is usually expressed in the unit of grams per mole (g/mol). The chemical formula for water is H2O. The molar mass of hydrogegn M(H) is 1.008 g/mol and of oxygen M(O) is 15.999 g/mol, so the molar mass of water is calculated as follows: M(H2O) = 2 x M(H) 1 x M(O) = 2 x 1.008 + 1 x 15.999 = 18.015

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