Question: how many molecules are in 200 grams of water?
Answer: Example: If someone can fit 200 gram (ml) of water into their mouth, how many moles of water is this: 200 grams of water x 1 mole of H2O = 11 moles 18grams 4. To find how many molecules of water are in someone's mouth: A mole of anything has 6.02x 1023 particles (this is Avogadro's number).