Concept explainers
(a)
Interpretation:
The resolution required to resolve the following peak should be stated:
Concept introduction:
The difference between the masses of the peaks of the mass spectrometer is called resolution.
(b)
Interpretation:
The resolution required to resolve the following peak should be stated:
Concept introduction:
The difference between the masses of the peaks of the mass spectrometer is called resolution.
(c)
Interpretation:
The resolution required to resolve the following peak should be stated:
Concept introduction:
The difference between the masses of the peaks of the mass spectrometer is called resolution.
(d)
Interpretation:
The resolution required to resolve the following peak should be stated:
Concept introduction:
The difference between the masses of the peaks of the mass spectrometer is called resolution.
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Chapter 20 Solutions
Principles of Instrumental Analysis, 6th Edition
- Q.1. Predict the relative intensity of the M, M+1, and M+2 peaks for a low resolution mass spectrum of a compound with molecular formula, C6H13Br. The natural abundances of the select isotopes are given below. 35 Cl: 75.8% 79Br: 50.5% 12C: 98.89% 37Cl: 24.2% (The ratio is almost 3:1) 81Br: 49.5% (The ratio is almost 1:1) 13C: 1.11%arrow_forwardA low-resolution mass spectrum of the neurotransmitter dopamine gave a molecular ion at m/z = 153. Two possible molecular formulas for this molecular ion are C8H11NO2 and C7H11N3O. A high-resolution mass spectrum provided an exact mass at 153.0680. Which of the possible molecular formulas is the correct one?arrow_forwardUsing a 60 MHz spectrometer, a chemist observes the following peak: doublet, J = 7 Hz, at 2.50 ppm What would be the chemical shift of this same peak as measured by a 300 MHz spectrometer? (Include units.)arrow_forward
- 9 What compound has a formula of C5H120 * ?and a peak at 3300 cm-1 (ähäi 1) Ether Alcohol Aldehyde Ketonearrow_forwardBelow is the mass spectrum of p-chlorotoluene Identify which peak belongs to the M+ peak/s.arrow_forward4. NMR: (8 pts) Look at the given molecules and answer the following questions H H Compound A Compound B Compound C OH H Compound D How many different chemical environments (number of peaks) would you expect to see in the 'H NMR for each molecule? A = B = C = D: = Predict how many sub peaks per multiplet would be seen in the signal for the indicated hydrogen due to spin-spin splitting? A = B = C = D = How many H of that particular type (integration) would you expect to see at the indicated hydrogen? A = B = C = D= =arrow_forward
- A mass spectrum with M+ at m/z = 101 with a minor M+1 peak contains what diagnostic atom? I believe the substance talked about may be C6H15N but I am not sure. Please explain.arrow_forwardIn an ideal mass spectrum of a compound, the following data (intensity) is given: M* = 80% %3D M +1 = 8.8% How many carbons are expected to be present in the parent molecule? 0 7 0 8 O 10arrow_forwarda) What resolution is needed to separate the ions C2H4 + and CH2N+ with masses of 28.0313 and 28.0187 respectively? b) What mass difference can just be resolved at m value of 1000 if the mass spectrometer has a resolution of 3000? c) Calculate the ratios (M+2) to M+ peak heights for the following two compounds C10H6Br2 and C3H7ClBrarrow_forward
- 13C(1h) what is bracket mean in this case? is that mean carbon nmr proton nmr in same time?arrow_forwardThe low-resolution mass spectrum of an unknown analgesic X had a molecular ion of 151. Possible molecular formulas include C7H5NO3, C8H9NO2, and C10H17N. Highresolution mass spectrometry gave an exact mass of 151.0640. What is the molecular formula of X?arrow_forward3. Fill in the following for the correspondence between % transmittance and absorbance: 100.0 % T = 0.0 absorbance 1.00 absorbance = (0.0 % T 25.0 % T = absorbance 0.25 absorbance = % Tarrow_forward
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
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