It seems that the US Mint has produced two separate mint sets for 1976. Are both of them needed for a collection or is one of them all-inclusive?
How do you separate Hydrogen and Oxygen gases in industrial electrolysis of water process?
In electrolysis, oxygen and hydrogen gas are produced at different electrodes (oxygen at the anode and hydrogen at the cathode). Since these electrodes do not have to be in close proximity, the hydrogen and oxygen will bubble upwards into separate collection vessels. If you needed to separate hydrogen and oxygen once mixed, the easiest way I can think of would be to cool the mixture to ~60K. At this point the oxygen would condense and leave hydrogen gas.