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Chapter 22: Q2TY (page 566)
A compound with a molecular ion at m/z 117 has a peak at m/z 118 with a relative intensity of 9.3%. Is there an odd or even number of N atoms? How many carbons are in the formula?
Odd 8C, It cannot be 9C because C9N would be at m/z .122.
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34: What is collisionally activated dissociation? At what points in a mass spectrometer does it occur?
Bone consists of the protein collagen and the mineral hydroxyapatite,. The content of archaeological humanskeletons measured by graphite furnace atomic absorption shedslight on customs and economic status of individuals in historicaltimes. 37 Explain why La3+is added to bone samples to suppressmatrix interference in Pbanalysis.
(a) Find the number of rings plus double bonds in a molecule with the composition C14H12and draw one plausible structure.
(b)For an ion or radical, the rings + double bonds formula gives noninteger answers because the formula is based on valences in neutral molecules with all electrons paired. How many rings plus double bonds are predicted for C4H10NO+? Draw one structure forC4H10NO+.
Explain what is meant by spectral, chemical, ionization, and isobaric interference.
30: (a)The mean free pathis the average distance a molecule travels before colliding with another molecule. The mean free path, l, is given by l 5 kT/(12sP), where kis Boltzmann’s constant, Tis temperature (K), Pis pressure (Pa), and s is the collision cross section. For a molecule with a diameter d, the collision cross section is pd2. The collision cross section is the area swept out by the molecule within which it will strike any other molecule it encounters. The magnetic sector mass spectrometer is maintained at a pressure of |1025 Pa so that ions do not collide with (and deflect) one another as they travel through the mass
analyzer. What is the mean free path of a molecule with a diameter of 1 nm at 300 K in the mass analyzer?
(b)The vacuum in an orbital mass separator is 1028 Pa. Find the mean free path in the orbital for the same conditions as (a).
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