23. Consider the mass spectrum of hexane. Relative Intensity 100 80 8 40 20 a. b. C. 10 MS-NW-5505 20 30 40 50 m/z Label the [M]* peak. What is the value of m/z associated with this peak? 60 70 ml. 80 What is the mass of a hexane molecule that contains six ¹²C atoms (¹2CH3-¹2CH₂-¹2CH₂-¹2CH₂-¹2CH₂-¹2CH3)? Does this fit with the m/z value reported in part a of this question? Draw a picture, like the one of "all ¹2C hexane" above, of a molecule that can account for the existence of a peak at m/z = 87 in the mass spectrum of hexane.
23. Consider the mass spectrum of hexane. Relative Intensity 100 80 8 40 20 a. b. C. 10 MS-NW-5505 20 30 40 50 m/z Label the [M]* peak. What is the value of m/z associated with this peak? 60 70 ml. 80 What is the mass of a hexane molecule that contains six ¹²C atoms (¹2CH3-¹2CH₂-¹2CH₂-¹2CH₂-¹2CH₂-¹2CH3)? Does this fit with the m/z value reported in part a of this question? Draw a picture, like the one of "all ¹2C hexane" above, of a molecule that can account for the existence of a peak at m/z = 87 in the mass spectrum of hexane.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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![**Mass Spectrum of Hexane**
This document presents the mass spectrum of hexane, showcasing a graph and a series of analytical questions.
**Graph Explanation:**
- **Title:** Mass Spectrum of Hexane
- **Axes:**
- **Y-Axis:** Relative Intensity (from 0 to 100)
- **X-Axis:** m/z (mass-to-charge ratio, ranging from 10 to 90)
- **Peaks:** Various peaks are observed at different m/z values, indicating the presence and relative abundances of different fragments of the hexane molecule.
**Questions:**
a. **Label the [M]^+ peak. What is the value of m/z associated with this peak?**
b. **What is the mass of a hexane molecule that contains six \(^{12}C\) atoms \((^{12}CH_3-^{12}CH_2-^{12}CH_2-^{12}CH_2-^{12}CH_2-^{12}CH_3)\)? Does this fit with the m/z value reported in part a of this question?**
c. **Draw a picture, like the one of "all \(^{12}C\) hexane" above, of a molecule that can account for the existence of a peak at m/z = 87 in the mass spectrum of hexane.**
d. **(Check your work.) There are actually three acceptable answers to the previous question because there are three unique locations in a hexane molecule to replace a \(^{12}C\) with a \(^{13}C\). If you have not already done so, draw the other two acceptable answers to the previous question.**
e. **The peak at m/z = 87 is called the [M+1]^+ peak. Construct an explanation for this name.**
f. **Use your periodic table to calculate the weight, in grams, of 1 mole of hexane to four significant figures (XX.XX).**
g. **Explain why 1 mole of hexane weighs slightly more than 86 grams.**
These items guide students through analyzing the mass spectrum and understanding molecular mass distribution, isotopic substitution, and calculations based on atomic masses.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa1871893-1489-414f-ba40-94b584c7772f%2F7bbb24ba-a0b3-4cd1-9f9c-23a6388b907d%2F5nhvuw9_processed.png&w=3840&q=75)
Transcribed Image Text:**Mass Spectrum of Hexane**
This document presents the mass spectrum of hexane, showcasing a graph and a series of analytical questions.
**Graph Explanation:**
- **Title:** Mass Spectrum of Hexane
- **Axes:**
- **Y-Axis:** Relative Intensity (from 0 to 100)
- **X-Axis:** m/z (mass-to-charge ratio, ranging from 10 to 90)
- **Peaks:** Various peaks are observed at different m/z values, indicating the presence and relative abundances of different fragments of the hexane molecule.
**Questions:**
a. **Label the [M]^+ peak. What is the value of m/z associated with this peak?**
b. **What is the mass of a hexane molecule that contains six \(^{12}C\) atoms \((^{12}CH_3-^{12}CH_2-^{12}CH_2-^{12}CH_2-^{12}CH_2-^{12}CH_3)\)? Does this fit with the m/z value reported in part a of this question?**
c. **Draw a picture, like the one of "all \(^{12}C\) hexane" above, of a molecule that can account for the existence of a peak at m/z = 87 in the mass spectrum of hexane.**
d. **(Check your work.) There are actually three acceptable answers to the previous question because there are three unique locations in a hexane molecule to replace a \(^{12}C\) with a \(^{13}C\). If you have not already done so, draw the other two acceptable answers to the previous question.**
e. **The peak at m/z = 87 is called the [M+1]^+ peak. Construct an explanation for this name.**
f. **Use your periodic table to calculate the weight, in grams, of 1 mole of hexane to four significant figures (XX.XX).**
g. **Explain why 1 mole of hexane weighs slightly more than 86 grams.**
These items guide students through analyzing the mass spectrum and understanding molecular mass distribution, isotopic substitution, and calculations based on atomic masses.
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