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
- Does ethyl radical be detected in Mass Spectrometry as a peak at m/z = 29. True or False?arrow_forwardCan a low-resolution mass spectrometer distinguish between C2H5+ and CHO+? a. Can a high-resolution mass spectrometer distinguish between them?arrow_forwardAn 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_forward
- Draw the molecular ion (M) for this molecule formed in the mass spectrometer. H IIZ: H -e Qarrow_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_forwardQ.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_forward
- Below 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_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_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 mass spectrum of 4-methoxybenzaldehyde B is shown in Figure 1. Assign the labelled signals and state whether each of your assignments is a fragment ion or a molecular ion. 4- methoxybenzaldehyde MASS SPECTRUM 100 136 80 60 78 108 40 20 0.0+ 0.0 40 80 120 160 m/z Figure 1 Rel. Intensityarrow_forward
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning