Which is the molar mass of H2O?

A water molecule contains two hydrogen atoms and one oxygen atom. Using atomic masses of about 1.01 g/mol for hydrogen and 16.00 g/mol for oxygen, its molar mass is 2(1.01) + 16.00 = 18.02 g/mol. Therefore, the molar mass of H₂O is 18.02 g/mol.

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