%TRANSMITTANCE 888 90 70 60 50 40 00 20 10 b) Assign two IR-absorption bands below the peaks in the following spectrum: *(b) A B 1780 cm 0 4000 3000 3200 2800 2400 2000 1800 1600 MICRONG 1400 WAVENUMBERS (CM) D 1200 1000 800 600 400
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- Convert the following wavenumbers (in cm-1) into their corresponding wavelengths (in nm) 3300 cm 3050 cm 2950 cm 1700 cm 750 cmDescribe the absorption profiles in this figure.Two infrared spectra are shown. One is the spectrum of cyclohexane, and the other is the spectrum of cyclohexene. Identify them, and explain your answer. (a) 100 * 80 60 40 20 4000 3500 3000 2500 2000 1500 1000 500 Wavenumber (cm-1) (b) 100 * 80 60 40 20 Transmittance (%) Transmittance (%)
- Express the following absorbances in terms of percent transmittances.(a) 0.0356(b) 0.379(c) 0.485(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 7.04258, 217, 175 nm are Amax for the observed to π* transition in UV-Vis. Choose from the following compounds to answer the questions below. A) Ethylene B) 1,3 butadiene C) 1,3,5 Hexatriene D) Ethane Compound(s) with Amax = 258 nm for the observed to T* transition in UV-Vis is/are: Choose... Compound(s) with Amax = 175 nm for the observed it to n* transition in UV-Vis is/are: Choose...
- Convert the accompanying transmittance data to absorbances: (a) 25.5% (b) 32.8% (c) 0.0853. A solution of [FeSCN]2 is found to have 37.4 % transmission at 447 nm. If the molar absorption coefficient (e) is 4400 at Amax 447 nm, what is the concentration of [FeSCN]2 in the solution?A photon of wavenumber 100 cm-1 has a wavelength of
- What length of mirror drive in a Michelson interferometer is required to produce a resolution sufficient to separate (a) IR peaks at 600.7 and 600.4 cm-1?(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 TPotassium dichromate and potassium permanganate have overlapping absorption spectra in 1M H2SO4. K2Cr2O7 has an absorption maximum at 440 nm, and KMnO4 has a band at 545 nm (the maximum is actually 525 nm, but using the longer wavelength is advantageous because interference from K2Cr2O7 is less). A mixture is analyzed by measuring the absorbance at these two wavelengths with the following results: A440= 0.405, A545= 0.712 in a 1-cm cell (actually as long as all the measurements are made in the same cell, for problems such as this, the exact pathlength cancels out in the calculations). The absorbance of pure solutions of K2Cr2O7 (1.00x10-3M) and KMnO4 (2.00x10- 4M) in 1 M H2SO4, using the same cell gave the following results: ACr2O7,440= 0.374, ACr2O7,545= 0.009, AMnO4,440= 0.019, AMnO4,545= 0.475. Calculate the concentrations of dichromate and permanganate in the sample solution.