Question

Consider the following reaction at 298K.
Co2+ (aq) + Cu (s) Co (s) + Cu2+ (aq)

Which of the following statements are correct?

Choose all that apply.
K > 1
Eocell > 0
The reaction is reactant-favored.
n = 5 mol electrons
delta Go > 0

Answer 1

The given reaction

Co2+ (aq) + Cu (s) = Co (s) + Cu2+ (aq)

The two half cell reactions are

Reduction reaction

Co2+ (aq) + 2e- = Co (s)

Ered = - 0.28 V

Oxidation reaction

Cu (s) = Cu2+ (aq) + 2e-

Eox = - 0.34 V

Standard reduction potential

E°cell = Eox + Ered

= - 0.34 - 0.28

= - 0.62 V

E°cell < 0

n = 2 mol electrons

G°= - nFE°cell

= - 2 x 96500 x (-0.62)

= 119660 J

G° > 0

K = exp (-G°/RT)

= exp (-119660/8.314 * 298)

= 1.06*10^-21

K < 1

Reaction is reactant favored.