Yours

7: END OF CHAPTER QUESTIONS-

An Introduction to Mass Spectrometry · LibreTexts

0%

Contents

    Text

    Size
    100%
    Theme
    Typeface
    Line length
    Spacing

    From LibreTexts, under not declared, as the source states it; its equations are written in TeX, which the PDF shows typeset. This page at LibreTexts.

    1. You work for a mass spectrometer vendor who sells all the instruments described here. Make a product table that shows all the different options for each major part of the mass spectrometer.
    2. Using thermochemical data, find the energy required to remove an electron from the following species: \(\mathrm{H}_{2}, \mathrm{Na}, \mathrm{C}, \mathrm{CH}_{4}\), and Fe. Express this energy in \(\mathrm{kJ} / \mathrm{mole}\) and eV (per atom).
    3. Using thermochemical data, determine the energy required to break the following bonds: \(\mathrm{H}-\mathrm{H}, \mathrm{C}-\mathrm{C}, \mathrm{C}=\mathrm{C}, \mathrm{C}-\mathrm{H}\), and \(\mathrm{C}-\mathrm{O}\). Express this energy in \(\mathrm{kJ} / \mathrm{mole}\) and \(\mathrm{eV}\) (per atom).
    4. Determine the kinetic energy, velocity, and momentum of the following ions: \(m / z 10,50\), 100 , and 1000. The ions are formed in the center of the source region, which is \(10.0 \mathrm{~mm}\) long and has a \(5000 \mathrm{~V}\) potential applied across the two ends.
    5. How long would it take each of the ions from question 4 to travel through a 1 meter flight tube in a TOF mass spectrometer?
    6. What magnetic field is required to select each of the ions from question 4 in a magnetic sector with a radius of 1 meter?
    7. What is the cy clotron frequency of each ion from question 4 in an ICR with a 3 T magnetic field?
    8. What electric field strength is required for each of the ions from question 4 to be selected by an electric sector with a radius of \(0.5\) meter?
    9. What is the \(m / z\) value for the molecular ion produced by EI of the following molecules: A) benzene, B) octane, C) trinitrotoluene, D) acetone, E) t-butyl amine.
    10. The highest mass ion observed in a mass spectrum is at \(m / z 127\). If the compound contains a single \(\mathrm{N}\) atom, could this be the molecular ion? If the compound contains four \(\mathrm{N}\) atoms, could this be the molecular ion? Why?
    11. The molecular ion in a high resolution mass spectrometry experiment is observed at \(m / z\) 58.0055. What is the molecular formula for this compound? If this was a low resolution mass spectrometer, what other molecular formula’s are possible?

    7: END OF CHAPTER QUESTIONS- is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.