4. You analyze a mixture of cyclopentane, pyrrolidine, and tetrahydrofuran by gas chromatography and obtain the following GC trace. N O cyclopentane pyrrolidine tetrahydrofuran area A= 100 intensity area B = 70 area C= 180 retention time (min) a) Label the peaks on the GC trace with the compounds they correspond to. Explain how you made your assignments. (Hint: look up the boiling points of the compounds.)
4. You analyze a mixture of cyclopentane, pyrrolidine, and tetrahydrofuran by gas chromatography and obtain the following GC trace. N O cyclopentane pyrrolidine tetrahydrofuran area A= 100 intensity area B = 70 area C= 180 retention time (min) a) Label the peaks on the GC trace with the compounds they correspond to. Explain how you made your assignments. (Hint: look up the boiling points of the compounds.)
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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Transcribed Image Text:**Gas Chromatography Analysis of Cyclopentane, Pyrrolidine, and Tetrahydrofuran**
In this exercise, the analysis involves a mixture of cyclopentane, pyrrolidine, and tetrahydrofuran, examined using gas chromatography (GC). Below is the GC trace obtained from the analysis, alongside an explanation of the data.
**Chemical Structures:**
- **Cyclopentane:** A five-membered carbon ring.
- **Pyrrolidine:** A five-membered ring with one nitrogen atom.
- **Tetrahydrofuran:** A five-membered ring with one oxygen atom.
**GC Trace Explanation:**
The GC trace graph plots *intensity* versus *retention time (min)*, highlighting three distinct peaks labeled A, B, and C. Each peak represents one of the compounds in the mixture. The areas under the peaks are given as:
- Area A = 100
- Area B = 70
- Area C = 180
**Retention Time and Peak Identification:**
- **Cyclopentane:** The first peak (A) due to its lower boiling point, eluting fastest.
- **Pyrrolidine:** Corresponds to the second peak (B).
- **Tetrahydrofuran:** The third peak (C), with the largest area.
**Task: Labeling Peaks**
- Label the GC trace peaks (A, B, C) with the corresponding compound names. Use the boiling points of the compounds to support your identification of peaks.
**Conclusion:**
The peaks are identified based on the order of elution, informed by their boiling points:
1. **Cyclopentane** (Peak A)
2. **Pyrrolidine** (Peak B)
3. **Tetrahydrofuran** (Peak C)
This exercise demonstrates the utility of boiling point in predicting the order of compound elution in gas chromatography, allowing for effective peak identification.
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