Elements Of Physical Chemistry
Elements Of Physical Chemistry
7th Edition
ISBN: 9780198796701
Author: ATKINS, P. W. (peter William), De Paula, Julio
Publisher: Oxford University Press
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Chapter 3, Problem 3A.1ST
Interpretation Introduction

Interpretation:

The change in entropy (ΔS) value has to be determined.

Concept Information:

Spontaneous process: A process which is initiated by itself, without the help of external energy source is called spontaneous process.  All spontaneous process is associated with the decrease in free energy in the system.

Entropy is the measure of randomness in the system. The entropy change in a reaction is the difference in entropy of the products and reactants. (ΔSrxn) can be calculated by the following equation.

ΔSrxn = SProducts- Sreactants

Where,

Sreactants is the entropy of the reactants

SProducts is the standard of the products

Standard entropy change in a reaction and entropy change in the system are same.

Using the value for the change in enthalpy in a system and the temperature, we can calculate ΔS for reaction of isolated system.

ΔS=qrevT

Expert Solution & Answer
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Explanation of Solution

The change in entropy is equal to the energy transferred as heat to the system reversibly divided by the temperature at which the transfer takes place.

Given: T =100oC+273K=373K; and the heat transferred to the large mass of water at 00C (qrev)=100kJ,

Thus, change in entropy at 1000C is,

ΔS=qrevT=100kJ373K=268J.K-1

Therefore, the change in entropy of the given system is 268J.K-1

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