The formula for moles to grams is: # of moles (in mol) x molar mass (in g/mol) = mass (in g). The molar mass of H2O, or water, is 18.01528g/mol. We can now plug in the values we know and get our answer. 1mol x 18.01528g/mol = 18.01528g of H2O.
Hope this helps!
