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In: Chemistry

Double bonds react with Br2 to form a dibromide. Isobutylene undergoes cationic polymerization under conditions where...

Double bonds react with Br2 to form a dibromide. Isobutylene undergoes cationic polymerization under conditions where chain transfer of a beta proton to monomer is the predominant chain-breaking reaction. A 4.0-g sample of the polymer was found to decolorize 6.0 mL of an 0.01 M solution of bromine in carbon tetrachloride. Calculate the number-average molecular weight of the polyisobutylene.

Solutions

Expert Solution

Number of moles of solution = Molarity * Volume
                                                             = 0.01 * 0.006 L
                                                              = 0.00006 mol
Number of moles of polymer = mass /molar mass
                                                            = 4/ molar mass
use:
Number of moles of Polymer = Number of moles of solution
4/ molar mass = 0.00006
molar mass = 66667 gm
Ans: 66667 gm

queen_honey_blossom answered 1 hour ago
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