engineering chemistry MCQ #2790

The standard reduction potential of a cell is 1.1 V. Calculate the standard Gibbs free energy change (ΔG°) at 25°C.

engineering chemistry MCQ #2790

  1. Question 1

    Q1. The standard reduction potential of a cell is 1.1 V. Calculate the standard Gibbs free energy change (ΔG°) at 25°C.

    • A) -212.3 kJ/mol
    • B) -106.15 kJ/mol
    • C) 212.3 kJ/mol
    • D) 106.15 kJ/mol

    Answer: -106.15 kJ/mol

    Explanation: ΔG° = -nFE°cell, where n = number of electrons, F = 96500 C/mol. At 25°C, ΔG° = -2 * 96500 * 1.1 = -212300 J/mol or -212.3 kJ/mol for n=2. For n=1, ΔG° = -106.15 kJ/mol.