7: END OF CHAPTER QUESTIONS-
- Page ID
- 388461
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- 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.
- 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).
- 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).
- 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.
- 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?
- What magnetic field is required to select each of the ions from question 4 in a magnetic sector with a radius of 1 meter?
- What is the cy clotron frequency of each ion from question 4 in an ICR with a 3 T magnetic field?
- 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?
- 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.
- 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?
- 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?