Two unlabeled samples are found in a lab. One is methylcyclohexane, the other is ethylcyclopentane. To identify them, the mass spectrum of each was taken, shown below. Which is sample A and which is sample B? Relative abundance (%) Relative abundance (%) 100 80 60 40 20 0 100 80 60 40 20 0 I 10 T L 10 20 20 17 17 41 40 41 40 55 60 m/z 55 60 m/z 69 80 80 83 Sample A 98 100 Sample B 98 100 120 120

Two unlabeled samples are found in a lab. One is methylcyclohexane, the other is ethylcyclopentane. To identify them, the mass spectrum of each was taken, shown below. Which is sample A and which is sample B? Relative abundance (%) Relative abundance (%) 100 80 60 40 20 0 100 80 60 40 20 0 I 10 T L 10 20 20 17 17 41 40 41 40 55 60 m/z 55 60 m/z 69 80 80 83 Sample A 98 100 Sample B 98 100 120 120

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter5: Stoichiometry

Section: Chapter Questions

Problem 43E: The mass spectrum of bromine (Br2) consists of three peaks with the following characteristics: Mass...

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The mass spectrum of bromine (Br2) consists of three peaks with the following characteristics: Mass (u) Relative Size 157.84 0.2534 159.84 0.5000 161.84 0.2466 How do you interpret these data?
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An element X bas five major isotopes, which are listed below along with their abundances. What is the element? Isotope Percent Natural Abundance Mass (u) 46x 8.00% 45.95232 47x 7.30% 46.951764 48x 73.80% 47.947947 49x 5.50% 48.947841 50x 5.40% 49.944792
The mass spectrum of CH3Cl is illustrated here. You know that carbon has two stable isotopes, and 13C with relative abundances of 98.9% and 1.1%, respectively, and chlorine has two isotopes, 35a and 37CI with abundances of 75.77% and 24.23%, respectively. (a) What molecular species gives rise to the lines at m/Z of 50 and 52? Why is the line at 52 about 1/3 the height of the line at 50? (b) What species might be responsible for the line at m/Z = 51?
The mass spectrum below corresponds to which of the following compounds? arbitrary units OOT 20 (A) 70 (B) Br 100 110 132 134 160 162 120 130 140 150 160 170 m/z OH to (C) CI (D)
A student has a liquid that is supposed to be 2-bromopropane. How could he confirm this using a mass spectrum? Group of answer choices AThe mass spectrum should have a peak at 124 amu. BThe mass spectrum should show a peak at 45 amu. CThe mass spectrum should show a peak at 43 amu. DThe mass spectrum should show peaks at 79 amu and 81 amu. EThe molecular ion peak should appear as a "doublet" at 122 and 124 amu. What does the abbreviaton "EI" stand for? Group of answer choices Aelectron ionization Belectromagnetic induction Celectron imaging Dearly ionization Eelectron intensity Which of the following transitions will exhibit the shortest wavelength in the UV-Vis spectrum? Group of answer choices Ap to p* Bn to s* Cn to p* Ds to s* Ep to s* Which of the following transition would be spin allowed? Group of answer choices An to s* Bp to p* Cn to p Dn to s En to p*
1. The sugar glucose contains C, H, and O and has a mass of 180.0634 amu as determined by high-resolution mass spectrometry. Glucose contains an equal number of carbon and oxygen atoms. What is the molecular formula of glucose? (1H = 1.00783 amu, 12C = 12.00000 amu, 160 = 15.99491 amu). Provide a thorough explanation.
Please refer to the table below: Name Chemical Formula Molecular Weight (CRC Handbook of Chemistry and Physics) 2-Propanol C3H80 60.095 Toluene C6H5CH3 92.139 trans-Azoxybenzene Methylamine Trimethylamine C12H10N20 198.219 CH5N 31.058 C3H9N 59.110 An unknown sample is run on a mass spectrometer producing a mass spectrum with a M of 60.Sut of the following choices, which chemical is most likely the unknown based on the mass ion peak.©GMU 2020 O trans-azoxybenzene O methylamine toluene O 2-propanol
14. Shown below are the mass spectra (without data tables) of four molecules. (The structure of each molecule is shown on the spectrum.) Mark the [M] peak for each, and indicate the molecular weight of the molecule. Relative Intensity Relative Intensity 100 80 60 40- 20 0-mm 10 100- 80 a. 20- 115-14-5501 0-mm 10 20 b. =0 20 30 30 40 40 50 50 60 m/z 60 m/z 70 70 80 80 90 100 90 100 Relative Intensity Relative Intensity 100- 80 40 20 0 100 80 40 10 20- 15-NU-5580 15 20 25 115--555 ont 10 20 30 30 35 40 45 50 55 m/z 40 50 m/z 60 60 70 65 70 75 80 Based on the five mass spectra you have seen, describe how one might identify the [M]* peak (molecular ion peak) on the mass spectrum of an unknown compound.
Explain the Schematic of a mass spectrometer ?
The highest mass peaks in the mass spectrum of Br2 occur at m/Z 158, 160, and 162. The ratio of intensities of these peaks is approximately 1:2:1. Bromine has two stable isotopes,79Br (50.7% abundance) and 81Br (49.3% abundance). question: What molecular species gives rise to each of these peaks? (Include the mass numbers of the isotopes in your answers.)
Determine the number of atoms of O in 13.3 grams of C12H22011. +/