Question

Using the information in the previous question: a. Predict the possible masses of individual molecules of $\mathrm{Br}_{2}$ b. Calculate the natural abundance of molecules with each of the masses predicted in part (a) in a sample of Br $_{2}$.

Name: Problem 121, Chapter 2: Chemistry The Science in Context
Uploaded: 2020-08-23T23:13:37-08:00
Duration: 1 min 56 s
Channel: Catherine Lemar
Description: Using the information in the previous question: a. Predict the possible masses of individual molecules of Br2 b. Calculate the natural abundance of molecules with each of the masses predicted in part (a) in a sample of Br 2.

   Using the information in the previous question:
a. Predict the possible masses of individual molecules of $\mathrm{Br}_{2}$
b. Calculate the natural abundance of molecules with each of the masses predicted in part (a) in a sample of Br $_{2}$.

Chemistry The Science in Context

Thomas R. Gilbert 5th Edition

Chapter 2, Problem 121

Instant Answer

Solved by Expert Catherine Lemar

08/23/2020

Step 1

There are two isotopes of bromine, $\mathrm{Br}^{79}$ and $\mathrm{Br}^{81}$. Therefore, the possible combinations are $\mathrm{Br}^{79}-\mathrm{Br}^{79}$, $\mathrm{Br}^{79}-\mathrm{Br}^{81}$, and $\mathrm{Br}^{81}-\mathrm{Br}^{81}$. Show more…

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Using the information in the previous question: a. Predict the possible masses of individual molecules of $\mathrm{Br}_{2}$ b. Calculate the natural abundance of molecules with each of the masses predicted in part (a) in a sample of Br $_{2}$.

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Key Concepts

Molecular Mass Calculation

This involves calculating the mass of a molecule by summing the masses of its constituent atoms. When each atom can exist in different isotopic forms, the molecule can have several possible masses depending on which isotope is present in each atomic position.

Statistical Abundance and Isotopic Distribution

This concept deals with applying the natural abundances of the various isotopes to predict the statistical likelihood of forming molecules with a specific isotopic composition. For diatomic molecules, the probabilities for each combination are computed using principles of combinatorics or the binomial distribution.

Isotope Theory

This concept involves understanding that elements exist as a mix of isotopes, which are atoms of the same element with different numbers of neutrons. In the context of calculating molecular masses, recognizing that each atom may have one of several possible masses due to its isotopes is fundamental.

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