38. The thermodynamic efficiency () of a reversible fuel cell operating under standard conditions is — Electrochemistry Chemistry Question

💡 Solution & Explanation

The theoretical thermodynamic efficiency of a fuel cell is defined as the ratio of useful electrical work extracted ($\Delta G^\circ$) to the total thermal energy available from the fuel's combustion ($\Delta H^\circ$). Therefore, $\eta = \Delta G^\circ / \Delta H^\circ$.