Which of the following formulae is consistent with a molecular ion of m/z 73 in a mass spectrometry experiment? O C3H8N2 O C4H11N O C4H100 C3H5CI
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- Mass spectrometry of chlorine from an asteroid sample is shown. Intensity 34 35 36 37 38 Mass u What is the relative abundance of 35C1 in this sample? 57.1% (42.9% _) 52.8%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.How many different "types of hydrogen" (hydrogens in different environments) are there in the compound shown below? Listed as possible answers below are four sets of mass spectrometry data, the first number being the m/z value for the peak and the number in parentheses being the relative abundance. Which set is consistent with the compound shown in Question #1? Choices: 150(50) and 151(5), 150(50) and 151(10), 150(5) and 152(10), 150(50) and 152(5)
- 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 100Mass spectrometry of chlorine from an asteroid sample shown. Intensity 34 35 36 37 38 Mass mu What is the relative abundance of 35C1 in this sample? 57.1% 42.9% 52.8%Question 4 Arrange the following steps according to the order of process in Mass spectrometry lon Separation lonization v Output/Data Result v Detection
- The mass spectrum below belongs to a compound that contains: Relative Intensity 100- 8 90 20- MS2011-04537CM 0-tbn Chlorine Bromine Fluorine Oxygen 25 50 75 m/z maltempl 100 125The 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)Match the molecular ion (from electron impact mass spectrometry) with the correct compound. (Make sure to consider the isotope pattern) 100 120 Br A 121 x B NH ន 122 Mass M/e 123 123 Me 124 124 OH но ма 125 D 126
- 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 0.83Draw the molecular ion (M+) for this molecule formed in the mass spectrometer. Br: -e 4Give an overview of the method of mass spectrometry and how it works.
