EBK CHEMISTRY
8th Edition
ISBN: 9780135216972
Author: Robinson
Publisher: PEARSON CO
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Chapter 3, Problem 3.102SP
Interpretation Introduction
Interpretation:
In the mass spectrometer, the path of a neutral molecule needs to be described. The reason for ionization to be a necessary first step needs to be explained.
Concept introduction:
In the ionization process in the spectroscopy, number of protons are absorbed by an atom resulting removal of electron from an atom to form ion.
The resulting electrical atom or charged molecule is called an ion. After collisions of atomic particles when the electron is lost, collisions with other ions, atoms, and molecules may occur or by interacting with the
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Mass Spectrometry of Molecular Compounds
Mass spectrometry is not only used for isotopic evaluation of the elements. It can also be used for
identification of molecular samples as well. Consider, for example, the mass spectrum of pentane
(Figure 5):
Lifie
relative
abundance
57
29
72
10
20
30
40
50
60
70
miz
Figure 5. Pentane Mass Spectrum
The pentane molecule (CH;CH,CH;CH;CH; or C;H12) is a straight-chain hydrocarbon. In Figure 5, notice
there are four groups of peaks. This forms what is known as the cracking pattern of the molecule. The
first peak is at m/z = 72, corresponding to the molecular ion, C;H,2", where only one electron was
knocked off the pentane molecule. The three peak groups are from fragments of pentane created in the
ionizer: m/z = 57 (CH;CH,CH,CH,"), m/z = 43 (CH;CH,CH;"), m/z = 29 (CH;CH,"). These species have had
pieces of the molecule knocked off in addition to losing an electron.
4. For the peak at m/z = 43, what part of the pentane molecule was knocked off? Use…
1. Provide the chemical formula (including brackets where appropriate) or systematic name for the following compounds.
(a) gold(I) hypoiodite
(b) HI(aq):
(f) Ca(ClO4)2·4H2O:
2. What mass (in g) of chlorine atoms are there in a sample that consists of 5e+23 molecules of molecular chlorine?
INSTRUCTIONS: Report your answer to 3 significant figures in scientific notation unless stated otherwise. DO NOT include the units in your answer.
Chapter 3 Solutions
EBK CHEMISTRY
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