The formula weight for H2O = 2 H atoms x 1.008 amu + 1 O atom x 16.00 amu = 18.016 amu
So the molar mass for H2O = 18.016 grams H2O
http://www.chem.qmul.ac.uk/iupac/AtWt/
A table with atomic weights.
(just to back golovko up).
To be 65 times that... damn. I know, liquid naquada?