average molecular weight (mass) = 27,980
repeated unit molecular weight = 2 x C + 4 x H
                                               Â
= 2 x 12 + 4 x 1
                                               Â
= 28 g/mol
degree of polymerization (DP) = average molecular weight /
repeated unit molar mass
                                               Â
= 27,980 / 28
                                               Â
= 999
degree of polymerization (DP) = 999