Question

Which shows the correct relationship?

Answer 1

Answer: B.) $E^0_{cell}$ > 0 = spontaneous reaction

Explanation:

The standard emf of a cell is related to Gibbs free energy by following relation:

$\Delta G=-nFE^0$

$\Delta G$ = gibbs free energy

n= no of electrons gained or lost

F= faraday's constant

$E^0$ = standard emf

when $\Delta G$= +ve, reaction is non spontaneous

$\Delta G$= -ve, reaction is spontaneous

$\Delta G$= 0, reaction is in equilibrium

Thus reaction is spontaneous when $E^0$= +ve

Thus reaction is non spontaneous when $E^0$= -ve

Thus reaction is in equilibrium when $E^0$= 0.

Answer 2

I think the correct answer from the choices listed above is option B. The correct relationship would be Eo cell > 0 = spontaneous reaction. For a spontaneous reaction, Ecell is positive and ΔG (Gibbs free energy, used to determine if a reaction occurs spontaneously) is negative. Hope this answers the question.