In electrolysis of water, why is the volume of gas collected over one electrode double the volume of gas collected over the other electrode?

In electrolysis of water, why is the volume of gas collected over one

1.	In electrolysis of water, why is the volume of gas collected over one electrode double the volume of gas collected over the other electrode?
Answer» Balance reaction for electrolysis of water is: H2O ------------------------------> H2 + 1/2O2 the electrolysis of one mole water produce one mole of H2 and HALF mole O2. at the same condition (temperature, pressure) from ideal GAS equation PV = nRT where R is gas constant apply for Hydrogen: PV1 = RT ----------------------(1) apply for OXYGEN: PV2 = RT/2 --------------------------(2) (1)÷(2) V1/V2 = 2 hence in the electrolysis of water volume of gas over one electrode is double the volume of gas collected over other electrode.