Interpretation:
How the given compounds (
Concept Introduction:
High resolution mass spectrometry: This method allows
Masses are generally not whole number integers, for example 1 proton =
One
All atoms other than
Nominal mass: The nominal mass for an element is the mass number of it is most abundant naturally occurring stable isotope and for an ion or given molecule the nominal mass is the sum of the nominal masses of the constituent atoms.
Example: The exact mass of the most abundant isotopes of each element
For example hydrogen
Average atomic mass value:
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Organic Chemistry
- At what masses do the molecular ions occur? What are the percentages of each molecular ion?arrow_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_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
- The highest mass peaks in the mass spectrum of Br2 occur at m/Z 158, 160, and 162. The ratio of intensities of these peaks is approximately 1:2:1. Bromine has two stable isotopes,79Br (50.7% abundance) and 81Br (49.3% abundance). question: What molecular species gives rise to each of these peaks? (Include the mass numbers of the isotopes in your answers.)arrow_forwardBromine has two naturally occurring isotopes, 79Br , abundance 50.52%, and 81Br, abundance 49.48%. The most stable form of bromine under standard conditions is as the diatomic molecule, Br2 . In a mass spectrum of bromine, at what m/z values would you expect to see peaks and what would you expect the relative height of the peaks to be? What species would account for each peak? Explain.arrow_forwardIs 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_forward
- At what masses do the molecular ions occur? What are the percentages of each molecular ion?arrow_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_forwardsketch an approximate mass spectrum of ethane ( C2H6)arrow_forward
- Match the molecular ion (from electron impact mass spectrometry) with the correct compound. (Make sure to consider the isotope pattern if necessary) 1001 50 Br A 121 B 122 B NH 123 123 Mass M/e 124 124 Me C 125 125 OH НО. 126 D CI 127arrow_forwardThere is mass spectrum. What is the molecule compound name?arrow_forwardUsing the rule of 13, what is a possible formula for M=113 (100%) on a mass spectrum? all of the above are possible molecular formulas CH130 CH15Narrow_forward
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