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A random poly(isobutylene-isoprene) copolymer has a number- average molecular weight of 201000 g/mol and a degree of polymeri

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molecular weight of iso butylene (CuHg) = 4x (MW) + 8x (MW) = 4x12 & 8x1 = sognemol molecular weight of isoprene ( Hg) = 5x(M

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