Question: how many molecules of water are present in 1 ml of water?
Answer: So we need to find the moles of water in 1 L of water or 1000mL of water. Taking the density of water to be 1g/mL, 1000mL of water= 1000g water. =3.34*10^25 molecules of water. Or 3.34*10^23 molecules in 1ml.