(a)
Interpretation:
The frequency difference at 4.69 T should be predicted.
Concept introduction:
Nuclear magnetic resonance is a technique that is used to predict the structural formula of the compound. NMR spectroscopy involves the examination of the nucleus under the external magnetic field.
(b)
Interpretation:
The frequency difference at 7.05 T should be predicted.
Concept introduction:
Nuclear magnetic resonance is a technique that is used to predict the structural formula of the compound. NMR spectroscopy involves the examination of the nucleus under the external magnetic field.
(c)
Interpretation:
The frequency difference at 18.8 T should be predicted. v
Concept introduction:
Nuclear magnetic resonance is a technique that is used to predict the structural formula of the compound. NMR spectroscopy involves the examination of the nucleus under the external magnetic field.
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Chapter 19 Solutions
Principles of Instrumental Analysis
- The bond length of CO is 112.82 pm. What resolution is needed (in wavelength or wavenumber) if you desire to be able to distinguish the l = 0 → 1 rotational line in the rotational spectrum of 12C160 from 13C16O? The mass of 12C is 12 amu (this is an exact value). The mass of 13C is 13.00335 amu. The mass of 160 is 15.99491 amu.arrow_forwardThe benzene radical anion has g = 2.0025. At whatfield should you search for resonance in a spectrometeroperating at (a) 9.302 GHz, (b) 33.67 GHz?arrow_forwardPlease answer asaparrow_forward
- (a) Calculate the energy difference between the two spin states of 1H and of 13C in a magnetic field of 6.8 T. 1H 4.0 1.19e-25 X J 13C 4.0 J (b) What is the precession frequency of a 1H nucleus at this magnetic field? Of a 13C nucleus? 1H 4.0 290 MHz 13C 4.0 73 MHz (c) At what magnetic field do protons precess at a frequency of 300. MHz? 4.0 7.04 Tarrow_forward(a) Calculate the energy difference between the two spin states of 1H and of 13C in a magnetic field of 6.8 T. 1H 4.0 1.91e-29 X J 13C 4.80e-33 X J (b) What is the precession frequency of a 'H nucleus at this magnetic field? Of a 13C nucleus? 1H 4.0 290 MHz 13C 4.0 73 MHz (c) At what magnetic field do protons precess at a frequency of 300. MHz? [4.0 7.04arrow_forwardDescribe the basic differences between fundamental vibrations and overtones in IR spectroscopy.arrow_forward
- 4. Is the C=O stretching frequency the same for acetone and deuterated acetone? Explain your answer. Identify C O overtone in acetone spectrum which corresponds to the transitionn from ground level n= 0, to the second excited levarrow_forwardCalculate (in cm-1) the separation between the energy levels of the possible orientations of the magnetic moment of the nuclear spin, due to the presence of an external field of 1.4092 T. Data: gyromagnetic ratio for a proton gamma = 2.668x108 s-1 T-1, c = 3×1010 cm/sarrow_forwardUsing the Boltzmann’s law, show that, for a spin-1/2 nucleus at thermal equilibrium at temperature T in a magnetic field Bo, the probabilities of finding it in the a and ß states are: yħBo e kT 1 yhBo 1+е kт Pa ; Pg : yhBo 1+е kTarrow_forward
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