Unformatted text preview: electrons. (c) Beginning with 1 M concentrations of each reactant and product at pH 7, in which direction will the
following reaction proceed?
The reaction will go in the direction of the lactate formation 2 (d) What is the standard free-energy change ( G’º ) at 25ºC for the conversion of pyruvate to lactate?
E' = (E pyruvate/lactate) - (E' NAD+/NADH = -0.185 V - (-.320 V) = .135 V
G' = -nJE' = -2(96.5 kJ/V x mol)(.135 V) = -26.1 (e) What is the equilibrium constant (K’eq) for this reaction?
lnK'eq = -G'/RT
= -(-26.1 kJ/mol)(2.48 kJ/mol) = -10.5
k'eq = e^10.5 = 3.63 x 10^4 7. (10%) Energy Span of the Respiratory Chain. Electron transfer in the mitochondrial respiratory chain
may be represented by the net reaction equation
(a) Calculate the value of E’º for the net reaction of mitochondrial electron transfer.
(b) Calculate G’º for this reaction.
(c) How many ATP molecules can theoretically be generated by this reaction if the free energy of ATP
synthesis under cellular conditions is 52 kJ/mol? a) 0.816 V - (-0.320 V) = 1.14 V
b) G' = -nJ E'
= -2(96.5 kJ/V x mol)(1.14 V) = -220 kJ/mol
c) (220 kJ/mol)/(52...
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