Physical Chemistry
2nd Edition
ISBN: 9781133958437
Author: Ball, David W. (david Warren), BAER, Tomas
Publisher: Wadsworth Cengage Learning,
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Question
Chapter 18, Problem 18.26E
Interpretation Introduction
Interpretation:
The minimum values for
Concept introduction:
Statistical
It is also called as canonical ensemble partition function.
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Q.1: The force constant of the bond in HCl is (516 N/m). Assuming the value of the
force constant does not depend on the mass of the atoms in the molecule, calculate
the fundamental vibrational frequency of each of the following: 'HCl. 'H'Cl and
?H*Cl.
Q.2: The Interatomic Distance in the HCl Molecule The spacing, A(1 /2) between the
lines in the rotational spectrum of HCI(g) is 20cm'.Calculate the distance between
the nuclei (the length of the bond) in the HCl molecule.
4. The n-electron system in benzene may be approximated as a particle-on-a-ring with a radius of r, which is also the
length of the C-C bonds in the ring. This bond length is approximately 1.39 A. The energy levels for the p-o-a-r are given
by:
n'h
E,
,where n = 0, t1, ±2, 13, .
2m,r?
The six r-electrons in benzene fill the (singly degenerate) n 0 level, and the (doubly degenerate) n=t1 level. The first
excited state, then corresponds to exciting an electron from n=1 to n=2.
a) Using the given bond length, calculate the energy change for the benzene molecule as an electron is excited
from n=1 to n=2.
b) Calculate the wavelength of light that benzene would need to absorb to undergo that energy change.
Compare that with the experimental value of 268 nm.
c) In what portion of the electromagnetic spectrum is this wavelength?
d) Using the experimental wavelength from part b above, calculate the effective bond length in benzene.
e) Is the particle-on-a-ring approximation valid? Give a…
Chapter 18 Solutions
Physical Chemistry
Ch. 18 - Prob. 18.1ECh. 18 - Prob. 18.2ECh. 18 - Prob. 18.3ECh. 18 - Prob. 18.4ECh. 18 - The following are the first four electronic energy...Ch. 18 - Prob. 18.6ECh. 18 - Prob. 18.7ECh. 18 - Prob. 18.8ECh. 18 - Prob. 18.9ECh. 18 - Prob. 18.10E
Ch. 18 - Prob. 18.11ECh. 18 - Prob. 18.12ECh. 18 - Prob. 18.13ECh. 18 - Prob. 18.14ECh. 18 - Prob. 18.15ECh. 18 - Prob. 18.16ECh. 18 - Prob. 18.17ECh. 18 - Prob. 18.18ECh. 18 - Prob. 18.19ECh. 18 - Prob. 18.20ECh. 18 - Prob. 18.21ECh. 18 - Prob. 18.22ECh. 18 - Prob. 18.23ECh. 18 - Prob. 18.24ECh. 18 - Prob. 18.25ECh. 18 - Prob. 18.26ECh. 18 - Prob. 18.27ECh. 18 - Prob. 18.28ECh. 18 - Prob. 18.29ECh. 18 - Prob. 18.30ECh. 18 - Prob. 18.31ECh. 18 - Prob. 18.32ECh. 18 - Prob. 18.33ECh. 18 - What are qnuc and qrot for N2(I=1)? See Table 18.3...Ch. 18 - The rovibrational spectrum of acetylene, HCCH,...Ch. 18 - Prob. 18.36ECh. 18 - Prob. 18.37ECh. 18 - Prob. 18.38ECh. 18 - Prob. 18.39ECh. 18 - Prob. 18.40ECh. 18 - Prob. 18.41ECh. 18 - Prob. 18.42ECh. 18 - Use equation 18.44 to show that pV=NkT.Ch. 18 - Prob. 18.44ECh. 18 - Determine E,H,G, and S for CH4 at standard...Ch. 18 - Prob. 18.48ECh. 18 - Prob. 18.49ECh. 18 - Calculate the heat capacity of NO2 at 298K and...Ch. 18 - Prob. 18.51ECh. 18 - In Chapters 17 and 18 we have derived expressions...Ch. 18 - Prob. 18.55ECh. 18 - Prob. 18.56ECh. 18 - Prob. 18.57ECh. 18 - Prob. 18.58ECh. 18 - Prob. 18.59ECh. 18 - Prob. 18.60E
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