MassSpecIsotopeTable

MassSpecIsotopeTable - 35.453 35 Cl 75.53 34.9689 37 Cl...

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MASS SPECTROMETRY ISOTOPE DATA WEIGHTS AND ABUNDANCES OF THE COMMON ISOTOPES ELEMENT ATOMIC WEIGHT NUCLIDE ABUNDANCE MASS _____________________________________________________________________________________________ Hydrogen 1.0079 1 H 99.985 % 1.0078 2 H 0.015 % 2.0141 Carbon 12.0112 12 C 98.89 % 12.0000 13 C 1.11 % 13.0034 Nitrogen 14.0067 14 N 99.63 % 14.0031 15 N 0.37 % 15.0001 Oxygen 15.9994 16 O 99.759 % 15.9949 17 O 0.037 % 16.9991 18 O 0.204% 17.9992 Fluorine 18.9984 19 F 100 % 18.9984 Silicon 28.086 28 Si 92.21 % 27.9769 29 Si 4.70 % 28.9765 30 Si 3.09 % 29.9738 Phosphorous 30.9738 31 P 100 % 30.9738 Sulfur 32.064 32 S 95.00 % 31.9721 33 S 0.76 % 32.9715 34 S 4.22 % 33.9679 Chlorine
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Unformatted text preview: 35.453 35 Cl 75.53 % 34.9689 37 Cl 24.47 % 36.9659 Bromine 79.909 79 Br 50.54 % 78.9183 81 Br 49.46 % 80.9163 Iodine 126.904 127 I 100 % 126.9045 Problem 1. The two highest masses seen in a low resolution mass spectrum of an unknown are 112 and 114 with relative intensities of 30% and 10%, respectively. What is the unknown? Problem 2. A low resolution mass spectrum of the alkaloid vobtusine showed the molecular weight to be 718, which could account for the molecular formulas C 44 H 54 N 4 O 5 , C 43 H 50 N 4 O 6 or C 42 H 46 N 4 O 7 . If a high resolution mass spectrum provided a molecular weight of 718.3743, what is the correct molecular formula for vobtusine?...
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This note was uploaded on 08/11/2010 for the course CHEM 30B Chem 30B U taught by Professor Miguelgarciagaribay during the Spring '10 term at UCLA.

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