How heavy is water molecule?

Saturday, February 19, 2011 at 4:30 am UTC + 05:30 Just a simple calculation, I did, says; the heaviest meson we know, is 35% lighter, than the water molecule, and about 22000 times heavier than electron. I am thinking along side the PDG list of particles; all atoms and molecules can have their properties mentioned … A quick division by 0.35 gives that water molecule is therefore, 62.86 K heavier than one electron. Thus the water molecule nucleus is 6.29 K times heavier than the total electrons it has revolving around its nucleus. (There are 2 H and 1 O = 10 electrons right? Or is it 18?)