Exhibit 18-3 Use the standard reduction potentials below to answer the following question(s).
Ce 4+ (aq) + e - →Ce 3+ (aq) E ° = 1.61 V
Fe 3+ (aq) + e - →Fe 2+ (aq) E ° = 0.77 V
I 2 (s) + 2 e - →2 I - (aq) E ° = 0.54 V
2 H + (aq) + 2 e - →H 2 (g) E ° = 0.000 V
Cd 2+ (aq) + 2 e - →Cd(s) E ° = - 0.40 V
U 4+ (aq) + e - →U 3+ (aq) E ° = - 0.61 V
CdCO 3 (s) + 2 e - →Cd(s) + CO 3 2 - (aq) E ° = - 0.74 V
Zn 2+ (aq) + 2 e - →Zn(s) E ° = - 0.76 V
U 3+ (aq) + 3 e - →U(s) E ° = - 1.80 V
Mg 2+ (aq) + 2 e - →Mg(s) E ° = - 2.37 V
-Refer to Exhibit 18-3. Which one of the following reactions proceeds spontaneously to the right when all reactants and products are in their standard states?

Question

Exhibit 18-3 Use the standard reduction potentials below to answer the following question(s). 
Ce 4+ (aq) + e - →Ce 3+ (aq) E ° = 1.61 V 
Fe 3+ (aq) + e - →Fe 2+ (aq) E ° = 0.77 V 
I 2 (s) + 2 e - →2 I - (aq) E ° = 0.54 V 
2 H + (aq) + 2 e - →H 2 (g) E ° = 0.000 V 
Cd 2+ (aq) + 2 e - →Cd(s) E ° = - 0.40 V 
U 4+ (aq) + e - →U 3+ (aq) E ° = - 0.61 V 
CdCO 3 (s) + 2 e - →Cd(s) + CO 3 2 - (aq) E ° = - 0.74 V 
Zn 2+ (aq) + 2 e - →Zn(s) E ° = - 0.76 V 
U 3+ (aq) + 3 e - →U(s) E ° = - 1.80 V 
Mg 2+ (aq) + 2 e - →Mg(s) E ° = - 2.37 V
-Refer to Exhibit 18-3. Which one of the following reactions proceeds spontaneously to the right when all reactants and products are in their standard states?

Quizplus · Accepted Answer

For a reaction to proceed spontaneously to the right, the overall cell potential (E°cell) must be positive. This is determined by subtracting the standard reduction potential of the anode (oxidation half-reaction) from the standard reduction potential of the cathode (reduction half-reaction). In option A, Fe^3+ is reduced (E° = 0.77 V) and I^- is oxidized (reverse of the given reduction potential, E° = -0.54 V). The overall cell potential is 0.77 V - (-0.54 V) = 1.31 V, which is positive, indicating spontaneity. The other options either result in negative E°cell values or involve non-spontaneous processes based on their standard reduction potentials.

Exhibit 18-3 Use the Standard Reduction Potentials Below to Answer