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Based on the given spectral information, draw the structure of the molecule.
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- What is the difference between an absorption spectrum and a standard curve?Spectral Analysis IR Analysis Interpret the IR spectrum. Transmitance 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 3500 3000 Infrared Spectrum 2500 Wavenumbers (cm-1) 2000 Cha 1500 1000Absorption What type of transition is induced by the electromagnetic radiation mostly absorbed by these substances? -12 1.5 L4-20 min L6-30 min 1.2 -L8-50 min Original 0.9 0.6 0.3 400 450 500 550 600 650 700 750 S00
- 3. A solution of [FESCN]2+ is found to have 31.8 % transmission at 447 nm. If the molar absorption coefficient (8) is 4400 at max 447 nm, what is the concentration of [FESCN]2+ in the solution?(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 7.04Draw the structure of the important peaks in the spectrum of C9H8O m/z - relative intensity 132 - 100.0 131 - 95 115 - 30. 114 - 20 104 - 30 103 - 42 79 - 33 78 - 32 77 - 57 53 - 50 51 - 26
- The chemical shift of the CH3 protons in acetaldehyde (ethanal) is δ = 2.20 and that of the CHO proton is 9.80. What is the magnitude of the difference in the local magnetic field between these two regions of the molecule when the applied field is 15.0 T? (submit answer in units μT microtesla)Transmittance (%) 100% 75% 50% 25% 0% 4000 3500 3000 OH 2500 2000 Spectrum 3B 1750 حسيمة 1500 Wavenumber (cm-¹) 1250 .OH 1000 OH 750 5003. 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?
- Potassium 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.Absorbance 0.5 0.45 04 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 200 Absorption Spectrum of CoCl₂(aq) 300 400 600 500 Wavelength (nm) Figure 1: Absorption Profile for cobalt (II) chloride¹ 700 800 Absorbance 06 0.5 04 0.3 0.2 0.1 0 Beer 0 max y=4.8571x+00038 0.05 Concentration (M) 01 Figure 2: Cobalt (II) chloride standard curve (Beer's Law Plot) ¹www.ucirvine.instructre.com 2. Place an arrow at the maximum absorbance and extrapolate the wavelength max. Amax = include the unit). (be sure 3. Determine by concentration of an unknown solution of cobalt (II) chloride having an absorbance of 0.25. a. Method 1: Extrapolation (mark the concentration on the plot) b. Method 2: Calculation (show your work)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= =