2) Alcohol dehydrogenase catalyzes the following reversible reaction: H-Ethanol

Question

2) Alcohol dehydrogenase catalyzes the following reversible reaction: H-Ethanol NAD AcetaldehydeNADH Use the following information to answer the questions below: Acetaldehyde 2H 2e -ethanol E0.20 V NAD. + H. + 2e,-+ NADH E"--0.32 V a) Write down the redox reaction for the conversion of acetylaldhehyde to ethanol by NADH a. Calculate " for the reaction as written. b. Calculate Gro for the reaction as written. c. What is the AG" for the reaction occurring in the reverse direction? (2 points) conditions? (2 points) e. calculate the Keg of using answer obtained in (b) (1pt)

Explanation / Answer

(A) redox reaction for acetlydhyde

Acetlydhyde + 2H _ethanol +NAD+NADH.

Explanation in this reaction Acetlydhyde is fermented into alcohol and NAD

+ is oxidize andNADH is reduced.

(b) E'of the reaction is E(redction) _E(oxidation)

0.20_(0.32) =0.12.

(c) G' of the reaction is nFEcell

2×96500×0.12=23160 .

(C) G' of reversible but the sine changed so G' of the reCtion is _23160.

(d) the reaction is spontaneous under normal conditions is fermentation of acetlydhyde because if once the reaction is initiated it would must leads to the product inany situation.

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