ORG.CHEM EBOOK W/BBWILEY PLUS>CUSTOM<
ORG.CHEM EBOOK W/BBWILEY PLUS>CUSTOM<
2nd Edition
ISBN: 9781118872925
Author: Klein
Publisher: JOHN WILEY+SONS INC.CUSTOM
Question
Book Icon
Chapter 9, Problem 48PP
Interpretation Introduction

Interpretation:

Temperature condition is needed to be explained in the given dehydrogenation reaction.

Concept introduction:

Dehydrogenation: dehydrogenation is a process of elimination of hydrogen molecule from the substrate at high temperature condition.

Free energy: reaction is feasible when free energy is negative.

ΔG=ΔH-TΔSΔG=freeenergyΔH=changeinenthalpyΔS=changeinentropy

Expert Solution & Answer
Check Mark

Answer to Problem 48PP

Reaction is feasible at higher temperature conditions only since ΔG is negative at higher temperatures. Therefore, higher temperatures are needed for dehydrogenation process.

Explanation of Solution

To explain: the conditions for the given reaction.

Given reaction is shown below.

ORG.CHEM EBOOK W/BBWILEY PLUS>CUSTOM<, Chapter 9, Problem 48PP

Clear from the reaction that the ethane molecule converted ethylene molecule at high temperature condition by releasing hydrogen gas.

Given reaction refers the dehydrogenation process at high temperatures. Given substrate is ethane and this ethane molecule heated at high temperature (7500 C) to produce ethylene and hydrogen gas.

To give: the reason for high temperatures needed for the dehydrogenation process.

Given reaction is favorable when ΔG is negative and change in enthalpy is positive for this reaction because two sigma bonds are braking to form one pi-bond. In addition, change in entropy is positive because one molecule is converting into two molecules. So depending on these conditions, reaction temperature should be high then only ΔG will be negative to feasible this reaction.

ΔG=ΔH-TΔSΔH= -ve ΔS=+ve

At higher temperature condition, the given reaction is feasible since ΔG is negative.

Conclusion

Conclusion

At higher temperature conditions, value of free energy will be negative so the dehydrogenation reaction is feasible at higher temperature conditions.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Chapter 9 Solutions

ORG.CHEM EBOOK W/BBWILEY PLUS>CUSTOM<

Knowledge Booster
Background pattern image
Recommended textbooks for you
Text book image
Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Text book image
Chemistry
Chemistry
ISBN:9781259911156
Author:Raymond Chang Dr., Jason Overby Professor
Publisher:McGraw-Hill Education
Text book image
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning
Text book image
Organic Chemistry
Chemistry
ISBN:9780078021558
Author:Janice Gorzynski Smith Dr.
Publisher:McGraw-Hill Education
Text book image
Chemistry: Principles and Reactions
Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Text book image
Elementary Principles of Chemical Processes, Bind...
Chemistry
ISBN:9781118431221
Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:WILEY