What is the standard EMF of the cell? — Electrochemistry Chemistry Question

💡 Solution & Explanation

The standard Gibbs free energy change for the formation of 1 mole of liquid water (H2 + 1/2 O2 -> H2O) is given as -237.39 kJ/mol, involving n = 2 electrons. Using the relationship ΔG° = -nFE°, we have -237,390 J = -2 × 96500 × E°. Solving for E° gives E° = 237390 / 193000 = 1.2299 V, which rounds to 1.23 V.