3. The area under three resonances were integrated digitally and the heights of the integrals were measured. The integral for peak "a" measured 2.40 cm. The integral for peak "b" measured 3.19 and the integral for peak "c" measured 7.20 cm. What is the relative peak ratio of protons for the three sets of resonances? List your ratio as "a:b:c". Show your work.

3. The area under three resonances were integrated digitally and the heights of the integrals were measured. The integral for peak "a" measured 2.40 cm. The integral for peak "b" measured 3.19 and the integral for peak "c" measured 7.20 cm. What is the relative peak ratio of protons for the three sets of resonances? List your ratio as "a:b:c". Show your work.

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter11: Atomic Mass Spectrometry

Section: Chapter Questions

Problem 11.2QAP

See similar textbooks

Similar questions

Following is the mass spectrum of 3-methyl-2-butanol. The molecular ion m/z 88 does not appear in this spectrum. Propose structural formulas for the cations of m/z 45, 43, and 41.
10. Predict the number of signals expected (disregarding splitting) in the 1H spectrum of а. OH b. .CI HO
10) The following spectra correspond to xylenes (dimethylbenzenes) ortho, meta and para. Which corresponds to which?
What are the main Chemical Interferences that affect the absorption of atomic line in AAS?
In a 300 MHz NMR spectrometer, A) what is the Larmor frequency in MHz of a 15N nucleus? g H = N 26.752; g = 2.7126; B) Using the same NMR instrument, suppose that a 13C nucleus from a sample generates a signal which has a frequency of 11,250 Hz higher than that from the carbons in TMS. What is the chemical shift of that carbon atom from the sample? A) 30 MHz; B) 0.15 ppm OA) 25 MHz; B) 0.35 ppm A) 35 MHz; B) 0.30 ppm OA) 25 MHz; B) 0.55 ppm
What would be the multiplicity associated with peak 2?
5. Calculate wavenumber for C=C and C=C by Hook's law. stronger bond higher frequency f force constant v =k/m Hooke's law M=mass k = constant smaller mass -higher frequency The force constant (f) of C=C 10 x 105 dyne/cm and C=C, 15 x 105 dyne/cm The mass (m) is the mass of atoms (or weights). The smaller the value of m, the higher the V of vibration. CH3O. H. HO capsaicin (spicy component of hot peppers)
For the following mass spectra determine: presence or absence of Cl and Br, molecular weight, of it is consistent with an odd number or zero/even number of N atoms, parent peak, base peak.
4. 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= =
3. Identify C-Cl stretching peaks in CDC13 and CHC13 spectra. Do these peaks have exactly the same frequencies for both compounds? Explain your answer. 4. Is the C==O stretching frequency the same for acetone and deuterated acetone? Explain your answer. 5. Identify C==O overtone in acetone spectrum which corresponds to the transition from ground level, n=0, to the second excited level, n=2.
Mass spectroscopic. What is the isotopic peak pattern of each : Organic compound with 2 bromine atoms. Organic compound with 2 chlorine atoms.
Q8.How many peaks will be observed in the low-resolution proton n.m.r. spectrum of (CH,),CHCOO(CH,),CH,? A 4 В 5 D 7