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Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Dumb question, just starting to learn about mass spectometry. I know we have to memorize the common radical fragments, M-15, M-29, etc, but lloking at the example, those numbers dont crrespond to the absorbance or the m/z, so for example, M-29. The absorbance for M-29 is at 100 , while the m/z is at 43. How is it designated to be M-29?

Relative Abundance
100
80
60
40-
20-
of
10
-(M-57)
20
30
-(M-43)
40
-(M-29)
m/z
50
-(M-15)
60
(M)**.
70
80
Relative Intensity
100 T
80-
60
40
20-
0+

Expert Solution

Step 1

molar mass is 72

molecular ion have (M^+.) = m/z = 72

(M-15) = m / z = (72 - 15) = 57

so (M-15) means m/z = 57 fragment.

(M-29) means m / z = 43 fragment.

and

(M-43) means m/z = 29 fragment.

and

(M-57) means m/z = 15 fragment.

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