Problem set 1 - 1 (a) What is the base peak in spectrum A...

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CHEM 527 Problem set 1 (due: Sep. 26) 1. An organic compound ( A ) is composed of carbon, hydrogen and nitrogen, with carbon constituting over 60% of the mass. It shows a molecular ion at m/z=112 amu in the mass spectrum. Answer the following two questions: (a)  Write a plausible Molecular Formula for compound A (5 points). (b) How many Rings + Double Bonds must be present in compound A (5 points)? 2. Which of the following compounds is most likely to have its base peak at m/z = 43? Please circle it (5 points). (a)CH 3 (CH 2 ) 4 CH 3 (b) (CH 3 ) 3 CCH 2 CH 3 (c) Cyclohexane (d) (CH 3 ) 2 CHCH(CH 3 ) 2 3. Chlorine gas can be analyzed by mass spectrometry. Calculate the relative intensities for the parent, p+2, and p+4 peaks form the EI spectrum (70 eV) of chlorine (Cl 2 ). Natural abundance info: 35 Cl (0.75), 37 Cl (0.25) (10 points). 4. The mass spectra of 1-pentanol and ethyl acetate are shown below but not necessarily in that order. Answer the following two questions: O OCH 2 CH 3 H 3 C ethyl acetate CH 3 CH 2 CH 2 CH 2 CH 2 OH 1-pentanol
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Unformatted text preview: 1 (a) What is the base peak in spectrum A (5 points) ? (b) Match each spectrum with the correct molecule. Assign at least 2 of the fragments (not including the parent ion peak) for each molecule (20 points). 5. Two of the major peaks in the mass spectrum of butanone occur at m/e values of 29 and 43. Indentify the ions (10 points). O CH 2 CH 3 H 3 C butanone 6. The atomic masses of some elements are shown. Element Relative atomic mass Hydrogen 1 H 1.0078 Carbon 12 C 12.0000 Nitrogen 14 N 14.0031 Oxygen 16 O 15.9949 2 (a) Using the data above, explain why nitrogen monoxide (NO) and ethane (C 2 H 6 ) can be distinguished with high resolution mass spectrometry (5 points). (b) High-resolution mass spectrometers are included on planetary space probes. Such a probe recorded gases with masses of 27.0109 and 31.0421. Identify these two gases, each containing elements from the group shown on the above Table (10 points). 3...
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This note was uploaded on 10/03/2010 for the course CHEM 527 taught by Professor Starnes,s during the Fall '08 term at Texas A&M University–Commerce.

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Problem set 1 - 1 (a) What is the base peak in spectrum A...

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