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An Hi/Air fuel cell operates at 80C and IZOkPa. Hydrogen is supplied in a dead-end mode. If the net electrochemical drag is 0.25 molecules of

An Hi/Air fuel cell operates at 80C and IZOkPa. Hydrogen is supplied in a dead-end mode. If the net electrochemical drag is 0.25 molecules of H2O per proton, calculate required relative humidity of hydrogen at the inlet so that there is neither water accumulation nor drying of the membrane on the hydrogen side of the fuel cell.

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