1 mole of water molecules has 18.0152 grams.
A mole is a unit measuring the quantity of anything. Water (H2O) is made from 2 atoms of hydrogen and 1 atom of oxygen. A mole of water molecules would be 2 moles of hydrogen atoms plus 1 mole of oxygen atoms.
- weight of water = 2(1.0079) g + 15.9994 g
- weight of water = 2.0158 g + 15.9994 g
- weight of water = 18.0152 g
Therefore, one mole of water weighs 18.0152 grams.