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
- Halogenated compounds are particularly easy to identify by their mass spectra because both chlorine and bromine occur naturally as mixtures of two abundant isotopes. Recall that chlorine occurs as 35Cl (75.8%) and 37Cl (24.2%); and bromine occurs as 79Br (50.7%) and 81Br (49.3%). At what masses do the molecular ions occur for the following formulas? What are the relative percentages of each molecular ion? (a) Bromomethane, CH3Br (b) 1-Chlorohexane, C6H13Clarrow_forwardMass spectrometry is often used to both identify and quantify compounds. What is different between mass spectra with changing concentrations of a compound? How would you design a method (i.e. what would you need) to both identify and quantify a compound using mass spectrometry?arrow_forwardWhich of the following formulae is consistent with a molecular ion of m/z 73 in a mass spectrometry experiment? O C3H8N2 O C4H11N O C4H10O O C3H5CIarrow_forward
- A 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_forwardBromine has two naturally occuring isotopes, Br-79 and Br-81, approximately 50% of each. Bromomethane will contain approximately 50% Br-79 and 50% Br-81. The mass spectrum peak for methane containing Br-79 will be referred to as the M+ (molecular ion) peak, and the peak for Br-81 will be called the M+2 peak, as Br-81 weighs two more amu than Br-79. What will be the locations of the two bromomethane peaks on the mass spectrum and what will be the approximate ratio of their heights?arrow_forwardThe mass spectrum of a small molecule is shown below. This molecule contains a carbon, but is not a hydrocarbon. There are no formal charges! Draw the structure of this molecule. 27 100 Relative intensity 50 10 20 30 40 m/zarrow_forward
- What is responsible for the small peak at m/z = 17 in the mass spectrum of CH4?arrow_forwardShown below are the IR spectrum and the Mass Spectrum of a compound of molecular formula C3H8O. Using the spectral data, determine the structure of the compound. Provide evidence from both spectra to support your answer.arrow_forwardBecause of the sensitivity of mass spectrometry, it is often used to detect the presence of drugs in blood, urine, or other biological fluids. Tetrahydrocannabinol (nominal mass 314), a component of marijuana, exhibits two strong fragment ions at mlz 246 and 231 (the base peak). What is the likely structure of each ion? HO, CH3 H H,C H,C CH, Tetrahydrocannabinolarrow_forward
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