Concept explainers
A low-resolution mass spectrum of the neurotransmitter dopamine gave a molecular ion at
Two possible molecular formulas for this molecular ion are
resolution mass spectrum provided an exact mass at
formulas is the correct one?
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Chapter 13 Solutions
Organic Chemistry
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- Which of the following compounds is most likely to correspond to the mass spectrum below? Provide explanations for your choice.arrow_forwardYou have conducted an experiment where you obtained 22.4g ZnCl2. The accepted value is 22.7g. What is the error and relative (%) error?arrow_forwardBy knowing the natural abundance of minor isotopes, it's possible to calculate the relative heights of M+ and M+1 peaks. If natural abundances are 12C - 98.9% and 13C - 1.10%, what are the relative heights, to the nearest 0.1%, of the M+ and M+1 peaks in the mass spectrum of benzene, C6H6? Ignore the contributions of isotopes like 2H (deuterium; 0.015% natural abundance) and 17O (0.04% natural abundance) that are small.The relative heights are, in order of increasing mass: 100 to ____arrow_forward
- Is the compound giving rise to the mass spectrum shown here more likely to contain sulfur, bromine, or chlorine? Explain. 100 80 - 60- 40 20 40 80 120 160 m/z Relative abundance -유arrow_forwardWhat type of compounds/molecules can be detected using LC-MS and what mass range or molecular mass ranges can be detected using LC-MS?arrow_forwardWhat is responsible for the small peak at m/z = 17 in the mass spectrum of CH4?arrow_forward
- Explain what can be determined from the following mass spectrum. M* = 123 Relative Intensity 100- 80 9 20 0-mmm 25 50 wytrwytatyt||||||qqıbıkm 75 m/7 100 125arrow_forward4arrow_forwardMatch the molecular ion (from electron impact mass spectrometry) with the correct compound. (Make sure to consider the isotope pattern) 100 120 Br A 121 x B NH ន 122 Mass M/e 123 123 Me 124 124 OH но ма 125 D 126arrow_forward
- If the mass spectrum of a sample has a 7.7% M+1 peak compared to a 100% M+ peak, how many carbon atoms are we then likely to have in our chemical formula?arrow_forwardFrom graphical analysis of a calibration plot, you generated the line y=2543.23x + 0.0034. Your sample had an Absorbance of 0.142. What is the concentration?arrow_forwardA mass spectrometer provides information about the: (a) electronic transitions and molecular vibrations occurring within a molecule. (b) elemental composition, molecular weight, and structural features of a molecule. (c) chemical environment and splitting pattern of the protons in a molecule. (d) chemical environment and splitting pattern of the carbons in a molecule. (e) Heat absorbed or liberated during a gas phase reaction. Identify the isotopic ion in the mass spectrum shown below. (a) Peak I IV (b) Peak II Peak III III (d) Peak IV (e) Peak V Identify the molecular or parent ion in the mass spectrum shown below. (а) Рeak I IV (b) Peak II II (c) Peak III III (d) Peak IV (e) Peak V Which of the labeled ions in the mass spectrum is most stable? (a) Peak I (b) Peak II (c) Peak III IV (d) Peak IV V II II (e) Peak Varrow_forward
- Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage Learning