What would be the mass of 3 moles of water molecules?

The molar mass of water is 18.0g / mol (16.0+2x1. 0). Three moles would have a mass which is three times greater or 3 x 18, which you can easily estimate. 3 x 20 = 60, so 3 moles of water will be a bit less than 60.

for points guys

i think it is true since you can test the answer and can use observations to complete it.