
Concept explainers
(a)
Interpretation:
The different molecular masses that are possible for the compound
Concept introduction:
Isotopes are atoms with the same
The formula to calculate the molecular mass of a compound is,
(a)

Answer to Problem 2.134P
The different molecular masses in
Explanation of Solution
The isotopes of nitrogen and oxygen are
The different molecules for the compound
The formula to calculate the molecular mass of
Substitute
The formula to calculate the molecular mass of
Substitute
The formula to calculate the molecular mass of
Substitute
The formula to calculate the molecular mass of
Substitute
The formula to calculate the molecular mass of
Substitute
The formula to calculate the molecular mass of
Substitute
The different molecular masses in
(b)
Interpretation:
The least and the most common molecular masses of
Concept introduction:
Isotopes are atoms with the same atomic number but a different mass number. The difference in the mass numbers of isotopes arises due to the difference in the number of neutrons in them. The mass number of an atom is the sum of the protons and neutrons in them. The number of protons of isotopes is the same but the neutron number varies. Due to the same number of protons in the isotopes, they occupy the same position in the periodic table.
(b)

Answer to Problem 2.134P
The most common molecular mass of
Explanation of Solution
The percent abundances of
The molecule that is composed of the isotopes with higher abundances will be the most common and hence, the molecular mass of that molecule will be the most common for the compound
Since the isotope
The molecule that is composed of the isotopes with lower abundances will be the most common and hence, the molecular mass of that molecule will be the least common for the compound
The most common molecular mass of
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Chapter 2 Solutions
Chemistry: The Molecular Nature of Matter and Change
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