Principles of Instrumental Analysis
7th Edition
ISBN: 9781337468039
Author: Skoog
Publisher: Cengage
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Question
Chapter 5, Problem 5.10QAP
Interpretation Introduction
Interpretation:
The number of individual spectra that will be summed to increase S/N value from 4.3 to 430 needs to be determined.
Concept introduction:
Signal-to-noise ratio (S/N) is a scale used in engineering and science to compare the level of the signal to the background noise. It is defined as ratio of power of signal to the noise and it is expressed in decibels.
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Label the spectrum with spectroscopy
Q1: Draw the most stable and the least stable Newman projections about the C2-C3 bond for
each of the following isomers (A-C). Are the barriers to rotation identical for enantiomers A and
B? How about the diastereomers (A versus C or B versus C)?
enantiomers
H Br
H Br
(S) CH3
H3C (S)
(R) CH3
H3C
H Br
A
Br
H
C
H Br
H3C (R)
B
(R)CH3
H Br
H Br
H3C (R)
(S) CH3
Br H
D
identical
Label the spectrum
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