Problem

Molecular weight data for some polymer are tabulated here. Compute the following:(a) the n...

Molecular weight data for some polymer are tabulated here. Compute the following:

(a) the number-average molecular weight
(b) the weight-average molecular weight.
(c) If it is known that this material’s degree of polymerization is 477, which one of the polymers listed in Table 14.3 is this polymer? Why?

Molecular Weight Range (g/mol)	xi	wi
8,000–20,000	0.05	0.02
20,000–32,000	0.15	0.08
32,000–44,000	0.21	0.17
44,000–56,000	0.28	0.29
56,000–68,000	0.18	0.23
68,000–80,000	0.10	0.16
80,000–92,000	0.03	0.05