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## Homework Statement

Calculate the open cell voltage for an H2/O2 fuel cell operating at P=1atm and T = 100°C

## Homework Equations

Nernst Eq: E

^{o}+(RT/nF)*ln[(a

_{H2})*(a

_{O2}^1/2)/(a

_{H2O})]

## The Attempt at a Solution

E=1.17V+((8.314J/mol-K)*(373K))/((2e

^{-})*(96486C/e

^{-}))*ln[(P

_{H2}*P

_{O2}^1/2)/P

_{H2O}]

I'm not sure what the partial pressures should be such as: P

_{H2}, P

_{O2}^1/2, and P

_{H2O}.

Any help would be MUCH appreciated. Thanks