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Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL2: Mass Spectrometry

Section: Chapter Questions

Problem 5CTQ

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Draw the molecular ion (M+) for this molecule formed in the mass spectrometer. Br: -e 4
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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.
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please help identify mass spectrometry
Given the following mass spec data, what is the molecular formula of the compound? (Show pertinent calculations on your submitted work.) Mass Intensity 104 (M+) 19.8 105 1.09 106 0.83
2clar ISTRY EXAM A Chemistry student performed an experiment on the preparation and identification of an ester. He was given solutions of a carboxylic acid and an alcohol. He then prepared the ester as per laboratory instruction and identified the odour of the ester as a pear flavour. A carboxylic acid has empirical formula CH,O, and its structure is determined by using various spectroscopic techniques. (a) The mass spectrum for this carboxylic acid molecule is given below. 100- 80- 60- relative intensity 40- 20- 10 15 20 25 30 35 40 45 50 55 60 65 70 75 mass/charge (m/e) (i) State the relative molecular mass of this molecule; hence determine its molecular formula. (ii) Draw the structural formula of the carboxylic acid and give its systematic name. ark (b) Use the information provided by its Infrared spectrum below to answer the following questions 100
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.)
Using the mass spectrum, determine the chemical formula including any chlorine, bromine or nitrogen present. This compound does not contain any oxygen atoms. I need help on this problem, please!
solve and match with the equations given. which one matches it? spectrometry
please help identify mass spectrometry
What is not true about mass spectrometry? Question 13 options: Only the molecular ion and cationic fragments are deflected, and they are then separated by their mass-to-charge ratio (m/z) It is used to determine the molecular weight and molecular formula of a compound. In a mass spectrometer, a compound is converted into ions, which are then separated by a magnetic field. In a mass spectrometer, a compound is first vaporized and then bombarded with electromagnetic radiation which generates a radical cation that is symbolized by (M)+• A molecular ion is often very unstable and susceptible to fragmentation

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Draw the molecular ion (M*) for this molecule formed in the mass spectrometer. -e :0: