12. Complete the table based on the molecular ion pattern for the following molecule (assume that low resolution mass spectrometry is used: 2 775 (rate ger Valus [M]* [M+2]* 148 63.9% [M+4]* Mass: 150 Abundance: 160% 10.2 57.41. 36.77 5.

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Can someone explain the math of how the abundance was calculated?

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### Mass Spectrometry Table Completion

**Objective:** Complete the table based on the molecular ion pattern for the given molecule, considering low-resolution mass spectrometry. 

**Molecule Structure:**  
- Benzene ring with two chlorine atoms attached (dichlorobenzene).

**Table Data:**

| Ion         | Mass | Relative Abundance (%) |
|-------------|------|------------------------|
| \([M]^+\)     | 146  | 100                    |
| \([M + 2]^+\) | 148  | 63.9                   |
| \([M + 4]^+\) | 150  | 10.2                   |

Additional notes in red:
- Integer values are emphasized.
- Handwritten calculations show computations for percentages (e.g., 57.4%, 36.7%, 5.9%).
- Comments indicate that certain values are "OK" or correct.
- There’s a boxed section with a final total calculation: "3.75", possibly a part scored as "1 pt each".

The molecule's pattern illustrates typical isotopic distribution due to chlorine, where peaks at \([M]\), \([M+2]\), and \([M+4]\) are evident. This distribution is characteristic of dichlorobenzene with two chlorine atoms, leading to significant peaks at these mass-to-charge ratios due to the natural isotopic abundance of chlorine (Cl-35 and Cl-37).

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Transcribed Image Text:--- ### Mass Spectrometry Table Completion **Objective:** Complete the table based on the molecular ion pattern for the given molecule, considering low-resolution mass spectrometry. **Molecule Structure:** - Benzene ring with two chlorine atoms attached (dichlorobenzene). **Table Data:** | Ion | Mass | Relative Abundance (%) | |-------------|------|------------------------| | \([M]^+\) | 146 | 100 | | \([M + 2]^+\) | 148 | 63.9 | | \([M + 4]^+\) | 150 | 10.2 | Additional notes in red: - Integer values are emphasized. - Handwritten calculations show computations for percentages (e.g., 57.4%, 36.7%, 5.9%). - Comments indicate that certain values are "OK" or correct. - There’s a boxed section with a final total calculation: "3.75", possibly a part scored as "1 pt each". The molecule's pattern illustrates typical isotopic distribution due to chlorine, where peaks at \([M]\), \([M+2]\), and \([M+4]\) are evident. This distribution is characteristic of dichlorobenzene with two chlorine atoms, leading to significant peaks at these mass-to-charge ratios due to the natural isotopic abundance of chlorine (Cl-35 and Cl-37). ---
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