Chemistry: Matter and Change
Chemistry: Matter and Change
1st Edition
ISBN: 9780078746376
Author: Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher: Glencoe/McGraw-Hill School Pub Co
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Chapter 15, Problem 103A
Interpretation Introduction

Interpretation:

Temperature at which ΔGsystem=-34.7kJ is to be calculated.

Concept introduction:

Free energy change, ΔGsystem is the difference between the system’s change in enthalpy ( ΔHsystem ) and the product of the kelvin temperature and the change in entropy ( TΔSsystem ). That is,

ΔGsystem=ΔHsystem-TΔSsystem

Expert Solution & Answer
Check Mark

Answer to Problem 103A

Temperature at which ΔGsystem=-34.7kJ is 265.8K

Explanation of Solution

Given information,

ΔGsystem=34.7kJΔHsystem=-28.8kJΔSsystem=22.2J/KΔSsystem=0.0222kJ/L(ConvertedJtokJ)

Since,

ΔGsystem=ΔHsystem-TΔSsystem-34.7kJ=-28.8kJ-T(0.0222kJ)0.0222T=28.8+34.7kJT=5.90.0222T=265.8K

Conclusion

In order to calculate Gibbs free energy( ΔG ), it is usually necessary to convert units because ΔS is usually expressed in j/K, whereas ΔH is expressed in kJ.

Chapter 15 Solutions

Chemistry: Matter and Change

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