Mass spectrometry is more often applied to moleculesthan to atoms. We will see in Chapter 3 that the molecularweight of a molecule is the sum of the atomic weights of theatoms in the molecule. The mass spectrum of H2 is takenunder conditions that prevent decomposition into H atoms.The two naturally occurring isotopes of hydrogen are 1H(atomic mass = 1.00783 amu; abundance 99.9885%) and2H 1atomic mass = 2.01410 amu; abundance 0.0115%2.(a) How many peaks will the mass spectrum have? (b) Givethe relative atomic masses of each of these peaks. (c) Whichpeak will be the largest, and which the smallest?

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter2: Chemical Compounds
Section: Chapter Questions
Problem 130QRT: The element bromine is Br2, so the mass of a Br2 molecule is the sum of the mass of its two atoms....
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Mass spectrometry is more often applied to molecules
than to atoms. We will see in Chapter 3 that the molecular
weight of a molecule is the sum of the atomic weights of the
atoms in the molecule. The mass spectrum of H2 is taken
under conditions that prevent decomposition into H atoms.
The two naturally occurring isotopes of hydrogen are 1H
(atomic mass = 1.00783 amu; abundance 99.9885%) and
2H 1atomic mass = 2.01410 amu; abundance 0.0115%2.
(a) How many peaks will the mass spectrum have? (b) Give
the relative atomic masses of each of these peaks. (c) Which
peak will be the largest, and which the smallest?

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