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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![### Gas Chromatography Analysis of Isomeric Butenes
**Question**
What is the relative percent yield of the major product of the three isomeric butenes analyzed via the GC analysis from Units 9 and 10? [Enter a value with 3 significant figures and without the % sign]
**Chromatogram Analysis**
A chromatogram is provided with an intensity (y-axis) versus retention time (x-axis) graph. The data file path is:
```
C:\GCsolution\Data\CH337 units 9, 10\Spring2016\TueLab_12_XXXXX.g
```
The peaks observed on the chromatogram correspond to different isomeric butenes. The retention times and the intensity give an indication of the presence and quantity of each compound.
**Peak Table - Channel 1 Details**
Below the chromatogram, there is a peak table:
| Peak# | Ret. Time | Area | Height | Name |
|-------|-----------|------|--------|------|
| 1 | 2.353 | 4524 | 2730 | |
| 2 | 2.421 | 17950| 10853 | |
| 3 | 2.479 | 5569 | 3276 | |
| **Total** | | **28043** | **16859** | |
### Calculation of Relative Percent Yield
To find the major product’s relative percent yield, you need to compare the area under the major peak (Peak 2) to the total area of all peaks.
- **Area of Major Peak (Peak 2)**: 17950
- **Total Area**: 28043
**Relative Percent Yield of Major Product**:
\[
\frac{17950}{28043} \times 100 = 63.98\%
\]
Therefore, the relative percent yield of the major product is **63.98** (to three significant figures: **64.0**).
### Interpretation
- **Retention Times**: Indicate the time taken for each compound to pass through the chromatographic column.
- **Areas under Peaks**: Proportional to the amount of each compound present in the sample.
Understanding the retention times and peak areas can help identify the compounds and their relative concentrations in the mixture.
For more details on interpreting GC data, please refer to the relevant sections of Units](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc36a7bdd-b424-4ceb-8898-9ce3c56bd183%2Fbe9cf995-308d-45f1-8b40-0a5a071c811a%2Fnk5ietb_processed.png&w=3840&q=75)
Transcribed Image Text:### Gas Chromatography Analysis of Isomeric Butenes
**Question**
What is the relative percent yield of the major product of the three isomeric butenes analyzed via the GC analysis from Units 9 and 10? [Enter a value with 3 significant figures and without the % sign]
**Chromatogram Analysis**
A chromatogram is provided with an intensity (y-axis) versus retention time (x-axis) graph. The data file path is:
```
C:\GCsolution\Data\CH337 units 9, 10\Spring2016\TueLab_12_XXXXX.g
```
The peaks observed on the chromatogram correspond to different isomeric butenes. The retention times and the intensity give an indication of the presence and quantity of each compound.
**Peak Table - Channel 1 Details**
Below the chromatogram, there is a peak table:
| Peak# | Ret. Time | Area | Height | Name |
|-------|-----------|------|--------|------|
| 1 | 2.353 | 4524 | 2730 | |
| 2 | 2.421 | 17950| 10853 | |
| 3 | 2.479 | 5569 | 3276 | |
| **Total** | | **28043** | **16859** | |
### Calculation of Relative Percent Yield
To find the major product’s relative percent yield, you need to compare the area under the major peak (Peak 2) to the total area of all peaks.
- **Area of Major Peak (Peak 2)**: 17950
- **Total Area**: 28043
**Relative Percent Yield of Major Product**:
\[
\frac{17950}{28043} \times 100 = 63.98\%
\]
Therefore, the relative percent yield of the major product is **63.98** (to three significant figures: **64.0**).
### Interpretation
- **Retention Times**: Indicate the time taken for each compound to pass through the chromatographic column.
- **Areas under Peaks**: Proportional to the amount of each compound present in the sample.
Understanding the retention times and peak areas can help identify the compounds and their relative concentrations in the mixture.
For more details on interpreting GC data, please refer to the relevant sections of Units
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