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- 1) A polyester made from sebacic acid (CAS# 111-20-6) and 1,6-hexanediol (CAS# 629-11-8) has the molecular weight fractionation listed below. Calculate an appropriate average molecular weight for this polyester. Source: Batzer, H., Macromolecular Chemistry and Physics 5A 5.00-mL aliquot of a solution that contains 3.05 ppm Ni2+ is treated with an appropriate excess of 2,3-quinoxalinedithiol and diluted to 50.0 mL. The molar absorptivity of a Ni2+- 2,3-quinoxalinedithiol solution at 510 nm is 5520 L mol-1 cm-1. What is the absorbance of the above diluted Ni2+- 2,3-quinoxalinedithiol solution at 510 nm in a 1.00-cm cell?Draw the structure of the predominant form of CF3CH2OH (pK a = 12.4) at pH = 6.
- Rank the following groups in order of decreasing priority. −F, −NH2, −CH3, −OHWILL HEXANE DISSOLVE fenethylline IN GC-MS?Calculate the concentration of atmospheric carbon compounds in ppbv using the data in the table below: Compound Concentration (µg/m3) Toluene 980 m,p-Xylene 910 o-Xylene 510 Benzene 370 Ethylbenzene 310 1,3,5-Trimethylbenzene 230 1-Ethyl-4-methylbenzene 200 Hexane 150 Heptane 130 1-Erthyl-2-methylbenzene 120
- 4. o-dichlorobenzene and p-dichlorobenzene can be separated by TLC. Which compound is more polar? Which compound travels faster on the TLC sheet when hexane is used as the solvent? Explain. (hint- consider molecular polarity) 5. p-dihydroxybenzene and o-dihydroxybenzene can be separated by TLC using a solvent of medium polarity. The ortho isomer has a significantly higher Rf value than the para isomer. Suggest a reason for this difference in Rf values. (hint- consider the structure of these two molecules) 6. Explain how TLC and column chromatography can be used together to ensure the perfect separation of two organic compoundsmmol of 1,3-dibenzoylpropane used to 4 sig. fig Used: 405 mg molecular weight: 252.31 g/molCompounds Mass 3-nitrophthalic acid used 200 mg = 0.2g 8% aqueous hydrazine used 0.4mL 3-nitrophthalhydrazide obtained 130 mg = 0.13 g sodium hydrosulfite dihydrate 0.6 g luminol obtained 70 mg = 0.07 g compute yield for nitrophthalhydrazide in the first step (assume nitrophthalic acid is limiting reagent) compute yield for luminol in the second step (using nitrophthalhydrazide as limiting reagent) compute yield for the overall reaction