What is the mass of one mole of water?

Mass of one atom of hydrogen is 1gm and mass of one atom of oxygen.

The molecular formula of water is H₂O.

The water molecule consists of two atoms of hydrogen and one atom of oxygen.

Therefore, 2 x Mass of hydrogen = 2 x 1 = 2gm.

1 x Mass of oxygen = 1 x 16= 18gm.

The mass of one mole of water =18 grams.

Hence, the mass of one mole of water is 18 grams