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Cell Potential: ∆G and K
Cell Potential: ∆G and K
20. Electrochemistry / Cell Potential: ∆G and K / Problem 2

Molten carbonate fuel cells (MCFC) are newly developed fuel cells that commonly use molten lithium and potassium carbonates as electrolytes. The half-reactions in the cell are shown below: 

Anode: H2(g) + CO32–(l) → H2O(l) + CO2(g) + 2 e

Cathode: 1/2 O2(g) + CO2(g) + 2 e → CO32–(l)

Using the thermodynamic values below, determine the cell potential (E°) and the equilibrium constant (K) for the overall reaction at 25°C. Identify whether the values of E° and K will increase, decrease or remain unchanged as the temperature decreases. 

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