Concept explainers
Interpretation:
How the given compounds (
Concept Introduction:
High resolution mass spectrometry: This method allows
Masses are generally not whole number integers, for example 1 proton =
One
All atoms other than
Nominal mass: The nominal mass for an element is the mass number of it is most abundant naturally occurring stable isotope and for an ion or given molecule the nominal mass is the sum of the nominal masses of the constituent atoms.
Example: The exact mass of the most abundant isotopes of each element
For example hydrogen
Average atomic mass value:
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Organic Chemistry
- 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_forwardDraw the molecular ion (M) for this molecule formed in the mass spectrometer. H IIZ: H -e Qarrow_forwardWhat type of compounds/molecules can be detected using LC-MS and what mass range or molecular mass ranges can be detected using LC-MS?arrow_forward
- Describe, using exact masses, the molecular ion region in the mass spectrum of the following compound: Br Br -Farrow_forwardIn the mass spectrum of an unknown organic compound, the molecular ion had a relative abundance of 19.0 while the M+1 had a relative abundance of 1.5. Estimate the number of carbons in the molecule. 1 4 7 2 LO 5 8 carbons 3 6 9 X Carrow_forwardAter analyzing a mass spectrum you conclude that the molecule being analyzed has the molecular formula C4H8; however, there are five possible constitutional isomers with that same molecular formula. the only thing that stands out in the mass spectrum is a strong fragment signal at m/z=41. Determine the possible constitutional isomers for C4H8 and explain which isomer matches the mass spectrum.arrow_forward
- Is the compound giving rise to the mass spectrum shown here more likely to contain sulfur, bromine, or chlorine? Explain. 100 80 - 60- 40 20 40 80 120 160 m/z Relative abundance -유arrow_forwardPlease sollllllvvve the part 1 and part 2, thanks siirarrow_forwardIn the mass spectrum of an unknown organic compound, the molecular ion had a relative abundance of 19.0 while the M+1 had a relative abundance of 1.5. Estimate the number of carbons in the molecule.arrow_forward
- Following is the mass spectrum of bromocyclopentane. The molecular ion m/z 148 is of such low intensity that it does not appear in this spectrum. Assign structural formulas for the cations of m/z 69 and 41.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_forwardi need the answer quicklyarrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage LearningOrganic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage Learning