Question

The standard emf of a galvanic cell involving cell reaction with n=2 found to be 0.295 at 298 k the equilibrium constant will be

Answer 1

Answer : The value of at 298 is,

Solution :

First we have to calculate the Gibbs free energy.

Formula used :



where,

= Gibbs free energy = ?

n = number of electrons = 2

F = Faraday constant = 96500 C/mole

= standard e.m.f of cell = 0.295 V

Now put all the given values in this formula, we get the Gibbs free energy.



Now we have to calculate the value of equilibrium constant.

Formula used :



where,

R = universal gas constant = 8.314 J/K/mole

T = temperature = 298 K

= equilibrium constant = ?

Now put all the given values in this formula, we get the value of





Therefore, the value of at 298 is,.....