Question

Which shows the correct relationship?

A.) Eo cell > 0 = nonspontaneous reaction
B.) Eo cell > 0 = spontaneous reaction
C.) Eo cell = 0 = nonspontaneous reaction
D.) Eo cell < 0 = spontaneous reaction

Answer 1

Answer: B.)
`E^0_(cell)` > 0 = spontaneous reaction

Step-by-step 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.