Physical Chemistry
2nd Edition
ISBN: 9781133958437
Author: Ball, David W. (david Warren), BAER, Tomas
Publisher: Wadsworth Cengage Learning,
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Chapter 14, Problem 14.80E
Interpretation Introduction
Interpretation:
An explanation as to how it would be determined whether KrF4 had tetrahedral or square planar geometry is to be stated.
Concept Introduction:
A molecule having N atoms uses x, y and z coordinates to describe the position of the each of the atoms. A molecule requires 3N coordinates to describe its position in space. For the change in position, the number of change in coordinates is the same, so N- molecule needs a total of 3N change in coordinates to describe its motion. The atoms are free to move in 3N different independent ways, so the molecule has 3N degree of freedom.
The number of vibrations or degree of freedom of linear molecule is 3N−5, and the number of vibrations or degree of freedom of nonlinear molecule is 3N−6. Only those vibrations which are involved in change in dipole moment are said to be IR-active vibrations.
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a. The change in the Gibbs energy of a certain constant pressure process is found to fit the expression:
AG-85.1 J mol −1 +36.5 J mol ¹K-1 × T
A. Calculate the value of AS for the process.
B. Next, use the Gibbs-Helmholtz equation:
(a(AG/T))
ΔΗ
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T2
to calculate the value of AH for the process.
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Chapter 14 Solutions
Physical Chemistry
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