Alcohol Dehydrogenase Catalyzes the Following Reversible Reaction:
Acetaldehyde + NADH $\rightarrow$

Alcohol dehydrogenase catalyzes the following reversible reaction:
acetaldehyde + NADH + H⁺ $\rightarrow$ ethanol + NAD⁺
Use the following information to answer the questions below:
acetaldehyde + 2H⁺ + 2e^- $\rightarrow$ ethanol
E'° = -0.20 V
NAD⁺ + H⁺ + 2e^- $\rightarrow$ NADH
E'° = -0.32 V
The Faraday constant, , is 96.48 kJ/V · mol.
(a) Calculate $\Delta$ G'° for the reaction as written. Show your work.
(b) Given your answer to (a), what is the $\Delta$ G'° for the reaction occurring in the reverse direction?
(c) Which reaction (forward or reverse) will tend to occur spontaneously under standard conditions?
(d) In the cell, the reaction actually proceeds in the direction that has a positive $\Delta$ G'°. Explain how this could be possible.