Consider a redox reaction between molecules a and b

This preview shows page 4 - 5 out of 5 pages.

We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Chemistry for Engineering Students
The document you are viewing contains questions related to this textbook.
Chapter 9 / Exercise 9.67
Chemistry for Engineering Students
Brown/Holme
Expert Verified
12.Consider a redox reaction between molecules A and B. Molecule A has a redox potential of 100 mV and molecule B has a redox potential of +100 mV. For the transfer of electrons from A to B, is the G° positive or negative or zero? Under what conditions will the reverse reaction, transfer of electrons from B to A, occur? 13.One of the problems in understanding redox reactions is coming to grips with the language. Consider the reduction of pyruvate by NADH:
We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Chemistry for Engineering Students
The document you are viewing contains questions related to this textbook.
Chapter 9 / Exercise 9.67
Chemistry for Engineering Students
Brown/Holme
Expert Verified
HW#9_Fall 2015 NAME: ________________________________ 5
Summing these two half reactions and their Eo` values gives the overall equation and its ∆Eo` value:Pyruvate + NADH + H+lactate + NAD+∆Eo` = +0.13VWhen a redox reaction takes place under nonstandard conditions, the tendency to donate electrons (∆E) is equal to ∆Eo` modified by a concentration term:∆E = ∆Eo` - 2.3𝑅𝑇𝑛𝐹𝑙𝑜𝑔[𝑙𝑎𝑐?𝑎?𝑒][𝑁𝐴𝐷+][𝑝𝑦𝑟??𝑎?𝑒][𝑁𝐴𝐷𝐻]where R = 1.98 x 10-3kcal/Kmole, T=temperature in kelvins, n= the number of electrons transferred, and F = 23 kcal/V mole. ∆G is related to ∆E by the equation:G = -nF∆ESince the signs of ∆G and ∆E are opposite, a favorable redox reaction has a positive ∆E and a negative ∆G.a.Calculate ∆G for reduction of pyruvate to lactate at 37oC, with all reactant and products at a concentration of 1 M. b.Calculate ∆G for the reaction at 37oC under conditions where the concentrations of pyruvate and lactate are equal and the concentrations of NAD+ and NADH are equal. c.What would the concentration term need to be for this reaction to have a ∆G of zero at 37oC? d.Under normal conditions in vascular smooth muscle (at 37oC), the concentration ratio of NAD+ to NADH is 1000, the concentration of lactate is 0.77 μmol/g, and the concentration of pyruvate is 0.15 µmol/g. What is ∆G for reduction of pyruvate to lactate under these conditions?

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture