For what purpose?
2 water molecules form one molecule of oxygen.
I am not clear about the answer required here. Elements form molecules. Many compounds form polymers, either naturally or synthetically.
Th synthesize one molecule of hexose sugar by photosynthesis six molecules of carbon dioxide are required to be assimilated. Since oxygen comes out by photolysis of water double the number of molecules of water are required to release six molecules of oxygen.
12 hydrogens.
7
23 moles of oxygen contain 138,509.10e23 molecules.
Air is 21% oxygen so 21% of 200 is 42 oxygen molecules.
2
4 molecules of oxygen - one to each subunit on the heme
4
20 hydrogen 10 oxygen
Carbon, Hydrogen, Oxygen, and Nitrogen are the four base elements of life.