Bromine also occurs in nature as two isotopes. What is the specific mass of each isotope? What is the ratio of the two isotopes?

EBK A SMALL SCALE APPROACH TO ORGANIC L
4th Edition
ISBN:9781305446021
Author:Lampman
Publisher:Lampman
Chapter88: Column Chromatography
Section: Chapter Questions
Problem 3P
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8. The gas chromatograph is set up to keep a constant flow of helium through the column. For this
experiment, it was set to deliver 1.2 ml. per minute of He through the column. This equates to a
linear velocity of 39.9 cm/sec. The column used in the GC is 0.25 mm in diameter and 30 m
long. What is the minimum retention time possible?
9. The three compounds should have eluted the GC in order of increasing boiling point as a rough
guide. It is interesting to note that o-dichlorobenzene has a higher boiling point than p-
dichlorobenzene, However, o-dichlorobenzene has a lower melting point than p-
dichlorobenzene. Account for this interesting difference in physical properties between the two
isomers.
Questions regarding the MS:
10. Bromine also occurs in nature as two isotopes. What is the specific mass of each isotope? What
is the ratio of the two isotopes?
11. Predict the mass spectrum of bromobenzene. What m/z value will the molecular ion have due to
the two isotopes of bromine?
21
Transcribed Image Text:8. The gas chromatograph is set up to keep a constant flow of helium through the column. For this experiment, it was set to deliver 1.2 ml. per minute of He through the column. This equates to a linear velocity of 39.9 cm/sec. The column used in the GC is 0.25 mm in diameter and 30 m long. What is the minimum retention time possible? 9. The three compounds should have eluted the GC in order of increasing boiling point as a rough guide. It is interesting to note that o-dichlorobenzene has a higher boiling point than p- dichlorobenzene, However, o-dichlorobenzene has a lower melting point than p- dichlorobenzene. Account for this interesting difference in physical properties between the two isomers. Questions regarding the MS: 10. Bromine also occurs in nature as two isotopes. What is the specific mass of each isotope? What is the ratio of the two isotopes? 11. Predict the mass spectrum of bromobenzene. What m/z value will the molecular ion have due to the two isotopes of bromine? 21
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