Please help me with the question below. A detailed explanation to aid in understanding is welcome. Calculate M, M, and the polydispersity index for a hypothetical polymer sample that contains equimo-lar amounts of polymer having molecular weights of 30,000, 60,000, and 90,000.

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Answered: Calculate M, M, and the polydispersity…

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter4: Recrystallization

Section: Chapter Questions

Problem 1Q

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Calculate Mn, Mw and the polydispersity index for a hypothetical polymer sample that contains equimolar amounts of polymer having molecular weights of 30,000, 60,000, and 90,000.
1
If 9 grams of polymer A with molecular weight of 30,000 Dalton is mixed with 5 grams of polymer B with molecular weight of 50,000 Dalton, calculate the number average molecular weight, weight average molecular weight and polydispersity index of the polymer mixture.
Explaining the following polymer size fractions in a polymer sample: Fraction Molecular Weight Number of Chains 1 3,250 400 2 5,000 500 3 500,000 4 a. Calculate the number-average molecular weight of the polymer. b. Calculate the weight-average molecular weight of the polymer. c. Which average molecular weight did the 4 chains of molecular weight of 500,000 most significantly affect? why ? d. Calculate the polydispersity index (PI = (Mw/Mn) of the polymer.
2-pentanone has a retention index of 987 on a poly(ethylene glycol) column (also called Carbowax). (a) Between which two straight-chain hydrocarbons is 2-pentanone eluted? (b) An unretained solute is eluted from a certain column in 1.80 min. Decane (C10H22) is eluted in 15.63 min and undecane (C11H24) is eluted in 17.22 min. What is the retention time of a compound whose retention index is 1 050?
Explaining the following polymer size fractions in a polymer sample: Fraction Molecular Weight Number of Chains 1 3,250 400 5,000 500 3 500,000 4 а. Calculate the number-average molecular weight of the polymer. b. Calculate the weight-average molecular weight of the polymer. c. Which average molecular weight did the 4 chains of molecular weight of 500,000 most significantly affect? why ? d. Calculate the polydispersity index (PI = (Mw/Mn) of the polymer.
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Why does a solid form at the interface of the two solutions? PROCEDURESynthesis of NylonIn a small beaker dissolve ~ 0.5 mL of sebacoyl chloride in 12 mL of ether. In a smalltest tube get ~ 6 mL (~1/4 of a 6 “ test tube) of 1,6-diaminohexane solution in water.In order to form the good polymer fibers, it is best to not mix the solutions. Youshould try to layer one solution on top of the other. First pour the 1,6-diaminohexanesolution into a 100 mL beaker. Then slowly pour the sebacoyl chloride down the sideof the tilted beaker with minimal mixing. At this point you should see two distinctlayers with a white film at the interface. Hook the nylon which forms at the interfacewith a straightened paper clip and pull slowly straight up as high as possible. Thenwrap it around your large beaker and then continue to wind the polymer around tillthe reaction is complete. Rinse your polymer in DI water to remove any salts or acidthat may be present.Weigh your product and characterize it by…
What does cross peak X tell you?
6.) An unknown polymer sample is fractionated, and the following molar fractions are obtained. Calculate Mn and Mw and the dispersity. Fill out the table to show your work. Fraction # 1 2 3 4 5 6 n₁ (mol) 0.004 0.011 0.009 0.003 0.017 0.008 M; (g/mol) 10,400 12,080 13,950 16,700 18,150 20,000 n¡Mi n;M;²
Dr. Alghe has just performed a restriction digest on DNA she extracted from her samples. She must now run her DNA out on a gel to separate the fragments based on size. To do this she must prepare a 1.2% agarose gel, where the percentage is determined as mass/vol. How many grams of agarose must she add to 200 mL of buffer in order to arrive at the correct percentage?
Chemistry Calculate Mn Mw Mz n1 100 80 70 50 30 M1 50 40 30 20 10 Example 2. Calculate Mn, Mw for mixtures having one part of A and two part of B. Monodisperse Polymer A (molecular weight: 100,000) Monodisperse Polymer B (molecular weight: 400,000)

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Calculate M, M, and the polydispersity index for a hypothetical polymer sample that contains equimo- lar amounts of polymer having molecular weights of 30,000, 60,000, and 90,000.