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Consider the hydrolysis reactions of creatine phosphate and adenosine-5 ′ -monophosphate. Creatine Phosphate + H 2 O → Creatine + HP i Δ r G ° ’ = −43.3 KJ/mol-rxn Adenosine-5 ′ -Honophosphate + H 2 O → Adenosine + HP i Δ r G ° ’ = −9.2 KJ/mol-rxn Which of the following combinations produces a reaction that is product-favored at equilibrium: for creatine phosphate to transfer phosphate to adenosine or for adenosine-5 ′ -monophosphate to transfer phosphate to creatine?

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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 18.7, Problem 1Q
Textbook Problem
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Consider the hydrolysis reactions of creatine phosphate and adenosine-5-monophosphate.

Creatine Phosphate + H2O → Creatine + HPi

ΔrG° = −43.3 KJ/mol-rxn

Adenosine-5-Honophosphate + H2O → Adenosine + HPi

ΔrG° = −9.2 KJ/mol-rxn

Which of the following combinations produces a reaction that is product-favored at equilibrium: for creatine phosphate to transfer phosphate to adenosine or for adenosine-5-monophosphate to transfer phosphate to creatine?

Interpretation Introduction

Interpretation:

Of the given combinations the one that produces product favoured reaction at equilibrium should be identified.

Concept introduction:

The Gibbs free energy or the free energy change is a thermodynamic quantity represented by ΔrGo. It can be calculated in a similar manner as entropy and enthalpy.  The expression for the free energy change is:

  ΔrG°fG°(products)fG°(reactants)

The reaction is product favored at equilibrium if the calculated ΔrGo value is negative.

The reaction is reactant favored at equilibrium if the calculated ΔrGo value is positive.

Explanation of Solution

The ΔrGo for the net reaction is calculated below,

Given:

The given reactions are:

  Creatine Phosphate + H2OCreatine + HPi

The ΔrGo for the reaction is 43.3 kJ/mol-rxn.

  Adenosine-5'-Monophosphate + H2OAdenosine + HPi

The ΔrG°' for the reaction is 9.2 kJ/mol-rxn.

The sign of ΔrG°' is reversed if the equation is reversed

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Chapter 18 Solutions

Chemistry & Chemical Reactivity
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