(PLEASE DO NOT ANSWER IF YOU DO NOT KNOW THE CORRECT ANSWER) 5. Chemical reactio

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(PLEASE DO NOT ANSWER IF YOU DO NOT KNOW THE CORRECT ANSWER)

5. Chemical reaction thermodynamics. As you heard in class, one of the reactions of glycolysis (a pathway of metabolism) involves the isomerization of dihydroxyacetone phosphate (DHAP) to glyceraldehyde 3 phosphate (GAP) This reaction is a reversible (DHAP GAP) When the reaction reaches equilibrium, the concentrations are: DHAP]-2x10 M, and [GAP] 95 x 10 M. What are the values [write the numbers and units for the following thermodynamic parameters? Equilibrium constant: K Reaction free energy at equilibrium: AG

Explanation / Answer

              DHAP <-----> GAP
at equil (2*10^-4)   (9.5*10^-6)
Keq = [GAP] / [DHAP]
Keq = (9.5*10^-6) / (2*10^-4)
Keq = 0.0475
dG = dG0 + RT ln Keq
since [DHAP] = [GAP] then dG = 0 at equilibrium then dG0 = - RT LnKeq
dG0 = -2.303RT log Keq
dG0 = -2.303 * 8.314 * 298 log(0.0475)
dG0 = 7550.58 J

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