Chemical reaction thermodynamics. As you heard in class, one of the reactions of

Question

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] = 2 times 10^-4 M, and [GAP] = 9.5 times 10^-6 M. What are the values [write the numbers and units] for the following thermodynamic parameters? Equilibrium constant: K_eq =______Reaction free energy at equilibrium: delta G =_______Reaction free energy at standard state (T = 298K, [DHAP] = [GAP] = 1 M): delta G^0 =________

Explanation / Answer

Equilibrium constant = Keq = [GAP] / [DHAP]

                                                 = (9.5 * 10^-6) / (2 * 10^-4)

                                                 = 0.0475

Reaction free energy at equilibrium = G = -RT* lnKeq

                                                                          = -8.315 * 298 * ln 0.0475

                                                                          = 7550.13 kJ/mol

For third condition Keq = [1]/[1] = 1

Reaction free energy at standard state =

   G® = -G-RT* ln Keq

                                                                      = -7550.13 - 8.315 * 298 * ln 1

                                                                      =-7550.13 – 0

                                                                      = -7550.13 kJ/mol

Or if we calculate without considering G, answer comes 0 kJ/mol

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