B) When the reaction A + B is at equilibrium, the concentrations of reactants ar

Question

B) When the reaction A + B is at equilibrium, the concentrations of reactants are as follows: [A] = 2 mM, [B]-3 mM, and [C] = 9 mM. What is AG°, for the reaction? C) The enzymatic hydrolysis of fructose-1-P is depicted belovw: Fructose-1-P + H2O fructose + Pi This reaction was allowed to proceed to equilibrium at 25°C. The original concentration of fructose-1-P was 0.2 M, but when the system had reached equilibrium, the concentration of fructose-1-P was only 6.52 42 10-5 M. Calculate the equilibrium constant and Gn for this reaction.

Explanation / Answer

Biochemistry

[B] Using,

dGo' = -RTlnK

K = [C]/[A][B]

with, [A] = 2 mM, [B] = 3 mM, [C] = 9 mM

R = gas constant

T = 25 oC + 273 = 298 K

we get,

dGo' = -8.314 x 298 ln(9/2 x 3)

         = -1.004 kJ

[C] for the given reaction,

at equilibrium,

[Fructose-1-P] = 6.5242 x 10^-5 M

[Fructose] = [Pi] = 0.2 - 6.5242 x 10^-5 = 0.19999347 M

R = gas constant

T = 25 oC + 273 = 298 K

dGo' = -RTlnK

Feeding the values in dGo's expression,

dGo' = -RTlnK

         = -8.314 x 298 ln(0.19999347)^2/6.5242 x 10^-5

         = -15.901 kJ

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