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(a)
Interpretation:
The concentration of isoprene in
Concept introduction:
The Lambert-Beer law says that the material absorbance is dependent upon the factors such as thickness of the sample and the concentration of the solution. According to the law, the absorbance is directly proportional to the concentration as well as the thickness of the sample. It also tells the relation between the intensity of light and the absorption by the material.
(b)
Interpretation:
The extinction coefficient of isoprene at
Concept introduction:
The Lambert-Beer law says that the material absorbance is dependent upon the factors such as thickness of the sample and the concentration of the solution. According to the law, the absorbance is directly proportional to the concentration as well as the thickness of the sample. It also tells the relation between the intensity of light and the absorption by the material.
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Chapter 15 Solutions
EBK ORGANIC CHEMISTRY
- Calculate the index of hydrogen deficiency of cyclohexene, C6H10, and account for this deficiency by reference to its structural formula.arrow_forwardOH 1. (a) Write the overall reaction scheme of the N-acetyltryosine methyl ester reacting water. The acidic proton is bolded in the N H structure. / N-acetyltyrosine methyl ester pK=10 (b) Based on your sketch, predict whether the N-acetyltryosine methyl ester is more soluble in 0.1 M HCl or 0.1 M NAOH. Justify your reasoning using your reaction above and chemical logic.arrow_forwardAn equimolar blend of 1,4-hydroquinone diallylether and ethylene glycol dimercaptoacetate containing a small amount of benzophenone (radical photoinitiator) is polymerized by irradiating the blend with ultraviolet (UV) light. (a) Write a balanced chemical equation for the polymerization. (b) How would you classify this polymerization according to the reaction mechanism? (c) Calculate the extent of reaction needed to produce a polymer with a number average molar mass of 20,000 g/mole (neglect the effect of end groups in the calculation). (d) Draw the structure of the polymer that is obtained when the mole ratio of diallyl ether to dithiol is 1.1. (e) Explain briefly the consequences of including a tetrafunctional thiol in the polymerization with the exact stoichiometry 2:1:4 of difunctional thiol to tetrafunctional thiol to difunctional allylic ether. HS HS 1,4-hydroquinone diallylether Ethylene glycol dimercaptoacetatearrow_forward
- The DPD colorimetric method is used to determine the amount of residual chlorine in the sample. In this method, the free chlorine in the sample oxidizes the colorless amine N,N-diethyl-p-phenylenediamine to a colored compound that absorbs strongly at 520 nm. The analysis of a set of calibration standards gave the following results:ppm Cl2 Absorbance0.00 0.00310.50 0.12321.00 0.32411.50 0.54382.00 0.76422.50 0.95513.00 1.1565A 10.00 mL water sample from a public water supply was diluted to 250 mL and analyzed for free chlorine residual, giving an absorbance of 0.3210.A. Find the equation of the line.B. What is the molar absorptivity of Cl2 (FW = 70.9) at 250 nm?C. Calculate the free chlorine residual of the sample as ppm Cl2.D. Calculate ppm BaCl2 (FW = 208.2)?arrow_forwardIbuprofen, 2-[4-(2- methylpropyl)phenyl]propanoic acid, is a medication used to reduce pain, fever, or inflammation. It is slightly soluble in pure water but well soluble in alcohols. From the formula of this molecule, is it possible to determine this molecule spectrophotometrically in solution without adding any reagents? Explain why yes or why not. CH3 CH3 но H3Carrow_forwardHow did you obtain the required reaction of K2Cr2O7 + 6CrSO4 + 7H2SO4→ 4Cr2(SO4)3 + K2SO4 + 7H2O?arrow_forward
- Consider the structure of quinine below and identify a suitable analytical technique for its quantitative analysis. In your answer: a) Name the technique and provide a reason for your selection. H₂C b) Explain the theoretical principle behind the technique and its application in quantitative analysis. H₂CO HO Narrow_forwardSystematically outline a protocol you will follow to process adulterated palm oil to gain qualitative and quantitative information spectroscopically about any added toxic dye. Explain also the basis for your protocol of choice.arrow_forwardSally obtains a standard calibration curve for their assigned food dye by plotting absorbance versus concentration (in M) of known solutions and finds the following slope and intercept: y = 1.646x + 0.026 Note: Copying and/or posting this or other questions without the express written permission from Dr. Burke and the Department of Chemistry & Biochemistry at the University of Delaware is a violation of intellectual property copyright law. Sally finds that her original Kool-aid sample is too concentrated, so they dilute it by transferring 13.00 mL of the original Kool-aid sample into a new container and diluting to a total volume of 37.00 mL. If the absorbance of the dilute Kool-aid sample at the appropriate wavelength for their assigned dye is 0.950, determine the concentration (in M) of the assigned food dye in the original Kool-aid sample. Report your answer with three places after the decimal.arrow_forward
- Under strongly acidic conditions, hexane is observed to undergo an isomerization process, during which it is converted into branched alkanes having the same molecular formula as hexane (C6H₁4). The rate at which each constitutional isomer is produced is related to the type of acid that is used in the reaction and the degree of mixing that occurs during the reaction (J. Chem. Soc., Perkins Trans. 2 1999, 12, 2715-2718). Step 1 Draw a bond-line structure of hexane. Draw Your Solution There are four branched isomers of hexane. Draw bond-line structures of all four of its isomers. Draw Your Solutionarrow_forwardDraw the structure of the predominant form of CF3CH2OH (pK a = 12.4) at pH = 6.arrow_forwardGiven the fact that O2, N2, and O in the upper atmosphere absorb most of the light with wavelengths shorter than 240 nm, would you expect thephotodissociation of C ¬ F bonds to be significant in the lower atmosphere?arrow_forward
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