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3. (7\%) For a fuel cell of hydrogen and oxygen, the thickness of the proton exchange membrane is 100m. The membrane conductivity is 0.09N1cm1. If the operating current density is 1A/cm2, what is the voltage drop across the proton exchange membrane? If the open circuit potential (OCP) of the hydrogen fuel cell is 1.00V. Estimate the fraction of membrane voltage drop out of OCP