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A sample of polyisoprene has one out of every 150 backbone carbon atoms crosslinked on the average. Its density is 0.97 g/cm at 25

A sample of polyisoprene has one out of every 150 backbone carbon atoms crosslinked on the average. Its density is 0.97 g/cm at 25 C. Calculate the initial (unextended) modulus for this rubber in MPa. Use R= 8.314 J/K-mole.

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