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Explain the types of electromeric effects +E and -E.
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- Calculate and report the energy, in units of joules, associated with each absorbance maximum.the absorbance of an equilibrium mixture of Fescn2+ was measured at 447nm and found to be 0.319. What is the equilibrium concentration of FeSCN2+?Please help me with this, I am trying to prepare for my final exam next week and I am just completely lost
- A 2.78 x 10-4 M solution of a compound has an absorbance of 0.469 at 520 nm in a 1.00 cm cell. The solvent's absorbance under the same conditions is 0.024. (a) What is the molar absorptivity of the unknown compound? 4.0 1687 X M-¹cm-1Avobenzone is used in sunscreens. A UV spectrum of a 3.0 mL sample of avobenzone (310.4 g/mol) in a 1.0 cm cell was obtained. The molar extinction coefficient for avobenzone is 9120 M¹¹cm ¹. The UV spectrum revealed a λ(max) of 300 nm with an absorbance of 0.80. Calculate the mass of avobenzone in the solution. O3) A compound, X, with a molecular weight of 292.16 g/mol was dissolved in a 5.00 mL volumetric flask and diluted to the mark. A 1.00 mL aliquot of this was withdrawn, placed into a 10.00 mL volumetric flask and diluted to the mark. The absorbance at 340 nm was 0.427 in a 1.000 cm cuvette. The molar absorptivity of X at 340 nm is 6130 M-¹ cm-¹ a) Using Beer's Law, what is the [X] (concentration in molarity) for the diluted solution in the cuvet ? mmmmm b) Use the dilution equation (McVc = MdVa) to calculate [X] in the original 5.00 mL flask. c) How many milligrams of X was used in the original solution ? (Find total moles X using original concentration and original volume - and then use the molar mass to go from moles to grams and then milligrams)
- Identify, synthesized and show the mechanism show in the spectroscopy4. The total absorbance of a solution is the sum of the absorbances of all different materials present. AT = Aa + Ap + Ac .. etc. At 427 nm, the molar absorbtivity of Yellow #5 is 2.73×10°M-1-cm1. At 427 nm the molar absorptivity of Red 40 is 7.49x103 M-1.cm-1. Calculate the total absorbance of a solution in which the concentration of Yellow #5 = 2.00x10-5 M and the concentration of Red 40 = 4.80x10-5 M, when measured at 427 nm in a 1.00 cm cell.Describe the mesomeric or resonance effect and differentiate between types +E or +M and -R or -M.
- What will be the corresponding concentration for a solution having an absorbance of 0.350 and a molar absorptivity of 420 L mol-1 cm-1. (path length = 1.0 cm)A student prepared several solutions of Molecule Bright, each at a different concentration. The absorbance of each solution was measured at 405 nm with a path length of 0.730 cm. The student then plotted the absorbance of each sample vs. its concentration (in mM), and found a best-fit line of y = 3.726x + 0.828. Calculate the molar absorptivity of the Molecule Bright (in M-1 cm-1).3D2: Recognize and interpret four levels of 1H NMR data: H group signal symmetry, peak height, signal splitting, and chemical shift (8) in the determination of organic structure. (a) Complete the data table for the given 'H NMR spectrum. 1H NMR Spectrum 10 9 label a b с d 8 7 6 8 (ppm) 1 5 1H, t (b) Deduce a structure for a MF of C6H12Osthat fits the 'H NMR data set. I 4 6H, s 1 3 2H, di #H (peak height/integral) 3H, s 2 1 splitting TMS 4 0 8 (ppm)
