有图 聚丙烯中乙烯含量The average molecular mass of a sample of commerc

The average molecular mass of a sample of commercial grade polypropylene (which is

known to contain some polyethylene) is 33400 and its degree of polymerization is 850.

Given the molar masses of ethylene monomer (C2H4) and propylene monomer (C3H6) are

29.06 g and 42.09 g, respectively. Calculate the relative proportion of ethylene monomers

in the material.