(A true story.) While organizing the undergraduate stockroom, a new chemistry professor found a half-gallon jug contain- ing a cloudy liquid (bp 100–105 °C), marked only "STUDENT PREP." She ran a quick mass spectrum, which is printed below. As soon as she saw the spectrum (without even checking the actual mass numbers), she said, "I know what it is." 100 57 80 60 136 107 40 93 20 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 mlz (a) What compound is the "student prep"? Any uncertainty in the structure? (b) Suggest structures for the fragments at 136, 107, and 93. Why is the base peak (at m/z 57) so strong?
(A true story.) While organizing the undergraduate stockroom, a new chemistry professor found a half-gallon jug contain- ing a cloudy liquid (bp 100–105 °C), marked only "STUDENT PREP." She ran a quick mass spectrum, which is printed below. As soon as she saw the spectrum (without even checking the actual mass numbers), she said, "I know what it is." 100 57 80 60 136 107 40 93 20 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 mlz (a) What compound is the "student prep"? Any uncertainty in the structure? (b) Suggest structures for the fragments at 136, 107, and 93. Why is the base peak (at m/z 57) so strong?
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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Mass spectrometry
Please show solution in a and b.
Transcribed Image Text:12-20
(A true story.) While organizing the undergraduate stockroom, a new chemistry professor found a half-gallon jug contain-
ing a cloudy liquid (bp 100–105 °C), marked only "STUDENT PREP." She ran a quick mass spectrum, which is printed
below. As soon as she saw the spectrum (without even checking the actual mass numbers), she said, "I know what it is."
100
57
80
60
136
107
40
93
20
10
20
30
40
50
60
70
80
90
100 110 120 130 140 150 160
m/z
(a) What compound is the "student prep"? Any uncertainty in the structure?
(b) Suggest structures for the fragments at 136, 107, and 93. Why is the base peak (at m/z 57) so strong?
abundance
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