Electrochemical Cells

To find the equilibrium constant ( ) for the given cell reaction at 25°C, we use the relationship given by the Nernst equation and the expression for the equilibrium constant:
The equation that relates the standard electromotive force ( ) of the cell and the equilibrium constant is given by:

Where:

Rearranging gives:

Substituting the known values:

Calculating:

Thus, is:

The correct equilibrium constant at 25°C is .