I only need help with Question 2. Instructor clarified to calculate the standard

Question

I only need help with Question 2. Instructor clarified to calculate the standard deltaE and deltaG for the net reaction.

2.(2pts) In the electron transport chain, a pair of electrons are transferred from NADH to Oxygen to make Water: NADH + H+ +0.502 NAD+ + H2O The standard reduction potentials for the half-reactions are given belovw NAD+ + 2e-+ H+ NADH 0.502 + 2e-+ 2H+ H3O Eo--0.320V E",= 0.81 6V 3. (1 pt) List the 3 key regulatory enzymes in the Citric Acid Cycle 4. (0.5pts) One of the intermediate molecule in TCA cycle is also involved in gluconeogenesis. Which molecule is that? 5. (0.Spts) What are the principal sources of electrons for the electron transport pathway?

Explanation / Answer

NADH --------> NAD^+ + H^+ + 2e^-             E0 = 0.320v
   0.5O2 + 2H^+ + 2e^- --------> H2O          E0   = 0.816v
--------------------------------------- ---------------------
NADH + H^+ + 0.5O2 -----------> NAD^+ + H2O E0cell = 1.136v
   n = 2
DG^0 = -nE0cell* F
        = -2*1.136*96500
        = -219248J

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