Chapter 10 Spectroscopy.docx

Chapter 10 Spectroscopy.docx - Mass Spectroscopy Rule of 13...

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Mass Spectroscopy Rule of 13 Example of calculating the molecular formula with carbon and hydrogen only. Mz =142 142:13 = 10.9 gives 10 carbon 10 x 13 = 130 142-130 = 12 12+10 = 22 gives 22 hydrogen C 10 H 22 Example of calculating the molecular formula with carbon, hydrogen and 1 oxygen only. Mz =142 142:13 = 10.9 gives 10 carbon 10 x 13 = 130 142-130 = 12 12+10 = 22 gives 22 hydrogen C 10 H 22 Add 1 oxygen and subtract 1 C and 4 H gives C 9 H 18 O
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Mass Spectroscopy Rule of 13 13, 26, 39, 52, 65, 78, 91, 104, 117, 130 IR Spectroscopy The existence of certain band(s) shows the presence of certain functional groups. If such a band is not there the functional group is absent. IR Stretching Vibrations Wavenumber in cm -1 Functional Group Intensity 3600-3200 Alcohol OH Strong, broad 3300-2500 Carboxylic Acid, OH
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  • Fall '19
  • Functional group, Aldehyde

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