Biochemistry: Concepts and Connections
Biochemistry: Concepts and Connections
1st Edition
ISBN: 9780321839923
Author: Dean R. Appling, Spencer J. Anthony-Cahill, Christopher K. Mathews
Publisher: PEARSON
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Chapter 14, Problem 1P
Interpretation Introduction

Interpretation:

The value of ΔG0' for the oxidation of malate in the presence of malate dehydrogenase should be calculated.

Concept introduction:

The standard free energy change for a reaction is related to the standard cell potential by the following equation,

  ΔG0'=nFE0'

Here, ΔG0' is the standard change in Gibbs free energy.

n is number of electrons involved

F is Faraday's constant (96485 C/mol)

Eo is the standard cell potential.

Expert Solution & Answer
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Explanation of Solution

The reaction is as follows:

  Malate (aq)+ NAD+(aq)Oxaloacetate(aq)+NADH(aq)+H+(aq)

The standard reduction potentials for the following half reactions are,

  Oxaloacetate (aq)+ 2H+(aq)Malate(aq)E0'=0.17VNAD+(aq)+H+(aq)NADH(aq)E0'=0.32V

The standard potential for the overall reaction will be,

  ΔE0'=Ecathode'-Eanode'=(0.32V)(0.17V)=0.15V

Calculating the standard free energy change,

  ΔG0'=-nFE0'=(2)(96485C1mole)(0.15V)=2895C.Vmol×1J1C.V×1kJ1000J=28.95kJ/mol

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