Concept explainers
Which of the following fragments produced in a mass spectrometer will be accelerated through the analyzer tube?
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Organic Chemistry
- Show how the compounds with the molecular formulas C6H9N and C5H5NO can be distinguished by the m/z ratio of their molecular ions in high-resolution mass spectrometry.arrow_forwardHow can you distinguish between following APIS in Mass Spec? Draw possible Mass spectra of ALL APIS and identify each peak H O H. H c-c CH,CH,CH,OH CH3 CH;CH,-C-C-CH CH3 H3C A H3C OH D но CH;CH CH2-C-C-H CH3 B.arrow_forwardWhich of the following compounds appears in the mass spectrum to have a baseline peak at m/z=43, indicating the reason OH B OH OH C Darrow_forward
- An unknown molecule was run through WT's mass spectrometer and the following spectra was produce. What could the unknown compound be? MASS SPECTRUM 100 50 80- 43 60 98 40 27 20- 83 0.0 0.0 20 40 60 80 100 m/z Rel. Intensityarrow_forwardDraw the molecular ion (M) for this molecule formed in the mass spectrometer. H IIZ: H -e Qarrow_forwardBelow is the mass spectrum and mass data of an unknown compound. 100 ns-Ku-0253 70 80 79 80 98 55 20- 66 25 50 75 100 125 m/z m/z Relative intensity (M + 1)* Peak 99 2.4% M" Peak 98 35.5 % 80 38.9 % 79 78.4 % 70 100 % 55 30.2 % Write the molecular formula of the unknown compound. Reative htensityarrow_forward
- Q.1. Predict the relative intensity of the M, M+1, and M+2 peaks for a low resolution mass spectrum of a compound with molecular formula, C6H13Br. The natural abundances of the select isotopes are given below. 35 Cl: 75.8% 79Br: 50.5% 12C: 98.89% 37Cl: 24.2% (The ratio is almost 3:1) 81Br: 49.5% (The ratio is almost 1:1) 13C: 1.11%arrow_forwardThe molecular ions of both C5H10S and C6H14O appear at m/z 102 in low-resolution mass spectrometry. Show how determination of the correct molecular formula can be made from the appearance and relative intensity of the M + 2 peak of each compound.arrow_forwardWrite molecular formulas for compounds that show the following molecular ions in their high-resolution mass spectra, assuming that C, H, N, and O might be present. The exact atomic masses are: 1.007 83 (1H), 12.000 00 (12C), 14.003 07 (14N), 15.994 91 (16O). (a) M+=98.0844 (b) M+=123.0320arrow_forward
- Halogenated compounds are particularly easy to identify by their mass spectra because both chlorine and bromine occur naturally as mixtures of two abundant isotopes. Recall that chlorine occurs as 35Cl (75.8%) and 37Cl (24.2%); and bromine occurs as 79Br (50.7%) and 81Br (49.3%). At what masses do the molecular ions occur for the following formulas? What are the relative percentages of each molecular ion? (a) Bromomethane, CH3Br (b) 1-Chlorohexane, C6H13Clarrow_forwardA low-resolution mass spectrum of the neurotransmitter dopamine gave a molecular ion at m/z = 153. Two possible molecular formulas for this molecular ion are C8H11NO2 and C7H11N3O. A high-resolution mass spectrum provided an exact mass at 153.0680. Which of the possible molecular formulas is the correct one?arrow_forwardThe following mass spectrum has a molecular ion and the M+2 ion. These molecular ions indicate the presence of a specific atom in the molecule. Identify this atom. Relative Intensity 100 80 8 40 20 0 ON 13C Br OCI 10 MS-NW-1039 20 30 40 50 60 m/z 70 80 90 100arrow_forward
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning