You can't electrolyze oxygen gas, of course. During electrolysis of water, the oxygen molecule is produced at the anode, and it, together with trillions of other oxygen molecules, forms a bubble...
Did you mean, what happens to the water molecule during electrolysis? That's a more difficult question. The reaction occurring at the cathode is
2H2O + 2e- ------> H2 + 2OH-
and the reaction occurring at the anode is
2H2O ------> O2 + 4H+ + 4e-
Perhaps you wanted to know a curly-arrow mechanism for these half-reactions. I can't help you there...
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You can't electrolyze oxygen gas, of course. During electrolysis of water, the oxygen molecule is produced at the anode, and it, together with trillions of other oxygen molecules, forms a bubble...
Did you mean, what happens to the water molecule during electrolysis? That's a more difficult question. The reaction occurring at the cathode is
2H2O + 2e- ------> H2 + 2OH-
and the reaction occurring at the anode is
2H2O ------> O2 + 4H+ + 4e-
Perhaps you wanted to know a curly-arrow mechanism for these half-reactions. I can't help you there...