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 12, Problem 12.9P
Interpretation Introduction

Interpretation:

The vibrational contribution to the molar entropy of B79r2 at 1000 K has to be calculated.

Concept Introduction:

The entropy in terms of partition function can be calculated using following formula.

S=UU(0)T+NAklnq

Where,

    S=entropyUU(0)=changeininternalenergyk=plank'sconstantq=partitionfunction

The expression for vibrational partition function is given below.

qV=11ehνkT

At high temperature the expression for vibrational partition will be as follows,

qV=kThν

Where,

    qV=vibrationalpartitionfunctionh=plank'sconstantk=boltzmannconstantT=temperatureν=vibrationalfrequency

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