This element provides about 89% of the weight of a water molecule
..... Water on the other hand, is a molecular compound that contains hydrogen 
and... [DOC] [TLE] Human elements | Robbert Bloem [PAR] Dec 2, 2014 ... half of the human body weight is water (2/3 hydrogen and 1/3 oxygen) ... times 
heavier than hydrogen the mass percentage of oxygen in water is 89%.