For this problem, we have to calculate for the ΔGf of I- when Ecell for the reaction is +0.74 V
Recall that ΔG can be calculated as:
In this case, we can calculate for the ΔGf of I- using the equation as:
Note that ΔGf for compounds in standard conditions are 0 (I2, H3O+ and O2)
To do so, we have to follow the steps:
Consider a galvanic cell that uses the reaction
4H3O+ (aq) + 4I- (aq) + O2 (g) → 2I2 (s) 6H2O (l).
If Ecell is +0.74 V, calculate ΔG°f of I- (aq) at 25 °C. Show all work and circle your final answer.
ΔG°f (H2O(l)) = -237.18 kJ/mol at 25 °C.
Anode: 4I-(aq) → 2I2(g) + 4e- ε°ox = =0.54 V
Cathode: O2(g) + 4H3O+(aq) + 4e- → 6H2O(l) ε°red = +1.23 V
Overall rx: 4H3O+(aq) + 4I-(aq) + O2(g) → 2I2(s) + 6H2O(l) ε°cell = 0.69 V
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Cell Potential concept. If you need more Cell Potential practice, you can also practice Cell Potential practice problems.
What is the difficulty of this problem?
Our tutors rated the difficulty ofConsider a galvanic cell that uses the reaction4H3O+ (aq) + ...as high difficulty.