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Calculate the molecular weight of poly vinyl chloride [monomer = (CH2-CHCl)n] composed of 2000 monomer units; express your answer in g•mol-1.
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- 1. Answer the following questions: (a) Why is free radical polymerization more commonly used today than ionic polymerization? (b) Almost all substituted ethylene monomers of commercial importance have the structure of CH2 = CHR or CH2 = CRR’ (where R or R' represent identical or different substituent groups). Why? (c) What are some methods for the production of conductive polymers? Give a few examples.(5) For the formula of C5H12O, (a) show your calculation and determine the degrees of unsaturation present, and (b) draw four of the structural/constitutional isomers possible for the formula.Illustrate the chemical structural formula for 3-methyl-3-ethylpentane. (b) Identify its chemical family as an isomer. (c) Provide the balanced chemical reaction equation for the combustion of one mole of this fuel with an equivalence ratio of ϕ=0.735
- A polymer closely related to PET is PBT, which is made from terephthalic acid and butane-1,4-diol.(a) Propose a structure for PBT and write the condensed formula for the structure.(b) What does PBT stand for? That is, what do you expect the trivial name of PBT to be?(c) Would you expect PBT to have a higher or lower melting point than PET? Justify your answer.(d) PBT, rather than PET, is used in molding because it crystallizes faster. Explain why PBT crystallizes more quickly than PET.We have a polyethylene sample containing 400 chains with molecular weight 5000 g/mol, 800 chains with molecular weight 7500 g/mol, 700 chains with molecular weight 10000 g/mol, and P chains (unit:number of chains) with molecular weight 12500 g/mol. Determine the weight average molecular weight of this polyethylene.A long polymer chain, such as polyethylene ( -CH2CH2- )n, can potentially exist in solution as a chiral object. Give two examples of chiral structures that a polyethylene chain could adopt.
- Name these organic compounds: structure name CH3 3-methyl-1-butyne CH; - CH –C= CH CH, CH, — сн, — с. CH; - CH; CH,-C= CH – CH,4.10 About 1 g (dry) of a sample of polyester polyol of Mn=3,000 was treated with bromoacetyl bromide (BrCH2COBr) to convert the hydroxyl end groups to bromoacetyl end groups. The treated polymer was found to contain 4.88% Br by elemental analysis. Estimate the average number of hydroxyl groups on each molecule of the polyol.3. Dacron is the brand name for the polymer that is made from ethane-1,2-diol and benzene-1,4-dicarboxylic acid. (a) What type of polymer is Dacron? (b) When the two monomers combine, what type of reaction do they undergo and what molecule is eliminated? (c) What is the name for the linkages that join the monomers together?(d) Draw the monomers and the polymer of the reaction to create Dacron. (Use a condensed structural formula in your answer.) HC-C styrene H-O-C- ethane-1,2-diol I H OH НО. 206 H -C-0-H H benzene-1.4-dicarboxylic acid.
- Name these organic compounds: structure name CH, CH, — сн, — с — сн, CH2 CH, — с — сн, CH; CH;- CH – C= CH(1) Write a complete chemical equation showing reactants, products, and catalysts needed (if any) for the following reaction and (2) Draw and name the organic compound found in every reaction. (a) Complete hydrogenation of 2-Methylhexa-1,5-diene (b) Complete halogenation (Br2) of 3-Ethyl-2,2-dimethylhept-3-ene (c) Reaction of (4E)-2.4-Dimethylhexa-1,4-diene with a mole of water (d) Reaction of cis-3,3-Dimethyl-4-propylocta-1,5-diene with two mole of HBr (e) Reaction of trans-1-Bromo-3-chlorocyclopentane with potassium hydroxide (f) Formation of Gilman reagent using isopropyl bromide (g) Ozonolysis of 3,3-Dimethyloct-4-yne (h) Complete halogenation (Cl2) of 3-Ethyl-5-methyl-1,6,8-decatriyne (i) Partial hydrogenation using Lindlar's Catalyst 2,2,5,5-Tetramethylhex-3-yne (i) Reaction of 3.4-Dimethylcyclodecyne with sodium amide4) A compound called vinyl chloride has a composition of 38.43% carbon, 4.838% hydrogen, and 56.72% chlorine. When vinyl chloride is polymerized (many single units linked together to form a long chain) under certain conditions, a white solid called polyvinyl chloride is formed with molecular mass of 23,875. What is the molecular formula of polyvinyl chloride ?