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Given the following GC-MS spectra. A. Draw structure of compound. B. Label base peak and molecular ion peak. Benzene 100- MS-NU-0075 80 60 40 20 - estanone 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 m/z Relative Intensity

Given the following GC-MS spectra. A. Draw structure of compound. B. Label base peak and molecular ion peak. Benzene 100- MS-NU-0075 80 60 40 20 - estanone 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 m/z Relative Intensity

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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**Title: Understanding GC-MS Spectra of Benzene** **Introduction:** This section provides an analysis of the given Gas Chromatography-Mass Spectrometry (GC-MS) spectrum for benzene. GC-MS is an analytical method that combines the features of gas-chromatography and mass spectrometry to identify different substances within a test sample. **Tasks:** A. **Draw the Structure of the Compound:** - Benzene is represented by a six-carbon ring with alternating double bonds, also known as a benzene ring. Its chemical formula is C₆H₆. B. **Label Base Peak and Molecular Ion Peak:** - **Base Peak:** This is the tallest peak in the mass spectrum and represents the most stable ion. In this spectrum, the base peak occurs at m/z = 78, which corresponds to the molecular ion of benzene, as it represents the C₆H₆⁺ ion. - **Molecular Ion Peak:** The molecular ion peak is the peak corresponding to the unfragmented molecule, which is typically the same as the base peak for simple molecules like benzene. In this case, it also occurs at m/z = 78, indicating the presence of the unfragmented benzene molecule. **Graph Description:** - **X-Axis (m/z):** The x-axis represents the mass-to-charge ratio (m/z) of the ions detected. - **Y-Axis (Relative Intensity):** The y-axis shows the relative intensity of the detected ion signals, indicating their abundance in the sample. - **Detailed Analysis:** The spectrum shows a prominent peak at m/z = 78, which is characteristic of benzene due to its molecular weight. Other smaller peaks represent fragment ions formed during the ionization process, though their intensities are much lower compared to the base peak. **Conclusion:** Understanding the GC-MS spectrum involves identifying the molecular ion peak and the base peak to determine the composition and structure of the compound. In the case of benzene, the overlapping base and molecular ion peak at m/z = 78 confirms its identity.
Transcribed Image Text:**Title: Understanding GC-MS Spectra of Benzene** **Introduction:** This section provides an analysis of the given Gas Chromatography-Mass Spectrometry (GC-MS) spectrum for benzene. GC-MS is an analytical method that combines the features of gas-chromatography and mass spectrometry to identify different substances within a test sample. **Tasks:** A. **Draw the Structure of the Compound:** - Benzene is represented by a six-carbon ring with alternating double bonds, also known as a benzene ring. Its chemical formula is C₆H₆. B. **Label Base Peak and Molecular Ion Peak:** - **Base Peak:** This is the tallest peak in the mass spectrum and represents the most stable ion. In this spectrum, the base peak occurs at m/z = 78, which corresponds to the molecular ion of benzene, as it represents the C₆H₆⁺ ion. - **Molecular Ion Peak:** The molecular ion peak is the peak corresponding to the unfragmented molecule, which is typically the same as the base peak for simple molecules like benzene. In this case, it also occurs at m/z = 78, indicating the presence of the unfragmented benzene molecule. **Graph Description:** - **X-Axis (m/z):** The x-axis represents the mass-to-charge ratio (m/z) of the ions detected. - **Y-Axis (Relative Intensity):** The y-axis shows the relative intensity of the detected ion signals, indicating their abundance in the sample. - **Detailed Analysis:** The spectrum shows a prominent peak at m/z = 78, which is characteristic of benzene due to its molecular weight. Other smaller peaks represent fragment ions formed during the ionization process, though their intensities are much lower compared to the base peak. **Conclusion:** Understanding the GC-MS spectrum involves identifying the molecular ion peak and the base peak to determine the composition and structure of the compound. In the case of benzene, the overlapping base and molecular ion peak at m/z = 78 confirms its identity.
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