Note that the values given are for biochemical standard state (310K, 1 atm and p

Question

Note that the values given are for biochemical standard state (310K, 1 atm and pH=7). FOUR PARTS..... WILL GIVE GOOD RATING

NAD+(aq)+H+(aq)+2e NADH(aq)

E!' = 0.320V

O(g)+4H+(aq)+4e 2HO(l) 22

E!' = +0.816V

A) Explain why the redox potential for the reduction of oxygen at standard state is

significantly more positive (+1.229V) than that at biochemical standard state.

B)Write a balanced chemical equation for the oxidation of NADH by oxygen (the net reaction for the ETC).

C)Calculate Eo’ and G0’ for the reaction.

D)If G0’ for the synthesis of ATP is 31.4kJ/mol, how many ATPs can be

synthesized using the energy provided in the ETC?

Explanation / Answer

A) in standard state oxygen remain as o2 so reduction of o2 require more E0 . in biochemical process o as nesent oxygen so it is more reactive toward reduction.

B) NADH(aq) NAD+(aq)+H+(aq)+2e multiplied by 2 for balenceing electron

2NADH(aq) 2NAD+(aq)+2H+(aq)+4e E0 = .320V * 2 = .640

O(g)+4H+(aq)+4e 2HO(l) E0 = +0.816V

net equation 2NADH(aq) + O(g)+ 2H+(aq) 2HO(l) + 2NAD+(aq)

c)E0 = .640 + 0.816V = 1.456

G0 =- n F E0

         = - 4 . 9500 . 1.456 = - 562.0 kJ

D) number ATP canbe synthesis = 562.0 kJ / 31.4 kJ = 18

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