of water from hydrogen and oxygen gases is given below.
+ O2(g) => 2H2O(g)
states that hydrogen and oxygen molecules react in the ratio 2:1.
So, 2 molecules of hydrogen will completely react with 1 molecule
of oxygen. Complete reaction will also occur when:
of oxygen react with 6 molecules of oxygen.
-8 molecules of oxygen react with 4 molecules of oxygen.
In fact, any combination of hydrogen and oxygen molecules, in the
ratio 2:1 will react completely.