Question

The standard reduction potentials for fluorine gas to the fluoride ion and the aluminum (III) ion to aluminum metal are 2.866 V and -1.662 V, respectively.

a) Write the balanced equation for the spontaneous redox reaction that occurs in an electrochemical cell under standard conditions. Include states of matter.

b) (1 point) Calculate the value of E°cell. V

c) (1 point)See Hint Calculate the maximum amount of electrical work produced by this cell.

Answer 1

a)

Oxidation : Al (s)   -----------> Al+3 (aq) + 3e-

Reduction : F2 (g) + 2e- ----------->   2F- (aq)

_______________________________________

overall balanced equation :

2 Al (s) + 3 F2 (g)   --------------> 2 Al+3 (aq) + 6 F- (aq)

b)

Eocell = Eored - Eooxi

           = 2.866 - (- 1.662)

E^ocell = 4.528 V

c)

delta Go = - n F Eo

               = - 6 x 96485 x 4.528

delta Go = - 2621.3

maximum amount of work = - 2621 kJ