Find the A and T% of a 6.5X10-4 mol L-1 solution of a drug (Molecular weight 200) whose absorptivity is 0.026 L cm1 g'at 520 nm when measured in a cell of 2.00 cm pathlength?
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- EI-MS of ortho nitrotoluene shows a large fragment ion at m/z 120 .The EI-MS of Tri deuteron ortho nitrotoluene does not show any peak at m/z 120 but does have a peak at m/z 122 .Show the fragmentation pattern that accounts for the above observation.Explain the order of chemical shifts of the carbon atoms in the 13C spectra of cyclohexanone (fig 22.6 ) and adipic acid (fig .22.9) attached below .Treatment of butan-2-one (CH3COCH2CH3) with strong base followed byCH3I forms a compound Q, which gives a molecular ion in its massspectrum at 86. The IR (> 1500 cm−1 only) and 1H NMR spectra of Q aregiven below. What is the structure of Q?
- All methyl esters of long-chain aliphatic acids (e.g., methyl tetradecanoate, C13H27COOCH3) show significant fragment ions at m/z 74, 59, and 31. What are the structures of these ions? How are they formed?A 4.0 x 10-5 M solution of a compound in hexane shows an absorbance of 0.40 at 252 nm in a cell with a 1 cm light path. What is the molar absorptivity of the compound in hexane at 252 nm?The leaves of the Brazilian Tree Senna multijunga contain a number of pryidine alkaloids that inhibit acetylcholinterinase. Two recentyl isolated isomeric compounds have the strcture have the strcture shown below. (NOTE: M=293) Use the mass spectral data provided to determine the precise location of the hydroxyl group in each isomer. Isomer A: EI-MS, m/z(rel. int): 222(20), 150(10), 136(25), 123(100) Isomer B:EI-MS, m/z(re;. int): 236(20), 150(10), 136(25), 123(100)
- A student completed a similar lab experiment and got an εavg of 56 M-1cm-1. If their change in absorbance (∆A) for the first 1.5 minutes was 1.089 and the cuvette was 1.0 cm wide, what was the rate for the first 1.5 minutes? Give your answer to the nearest 0.001 M/min.Why is it better to acquire the 1H-NMR spectrum in DMSO-d6 and not in CDCl3?A solution was prepared using 1.0 mg of a compound of Molecular weight 160 g / mol isdissolved in 10 mL of Ethanol and part of the solution is placed in a 1 cm UV cell. TheUV spectrum is taken at a (I: 247 nm). The maximum absorbance is 0.5. Determine the value of molar absorptivity (c) in M ^ -1cm ^ -1
- Whta is the Difference of infrared spectrum for the starting material and product?which one can be use to determine successfully made product? The starting mat.=0.819g Mass of prd=1.06g melting point range=83-85The molar absorptivity of 2,5-dimethyl-2,4-hexadiene in methanol is 13,100 M-1cm-1. What concentration of this diene in methanol is required to give an absorbance of 1.6? Assume a light path of 1.00 cm. Calculate concentration in these units. Q.) Moles per liter(a) What is the molar absorptivity of compound Z at 295 nm and 348nm, given the absorption spectrum shown in Fig.22-14 (which was obtained using a UV-Vis spectrophotometer and a 1mM solution of compound Z in a sample cell with a path length of 1 cm)? (b) Now you have decided to make quantitative measurement of the level of compound Z in different solutions. Based on the above spectrum, which wavelength will you use for your measurements? Give two reasons why this is the optimum wavelength.
