The following table lists molecular weight data for a polytetrafluoroethylene material. Compute the following:
(a) the number-average molecular weight
(b) the weight-average molecular weight
(c) the degree of polymerization
Molecular Weight Range (g/mol) | xi | wi |
10,000–20,000 | 0.03 | 0.01 |
20,000–30,000 | 0.09 | 0.04 |
30,000–40,000 | 0.15 | 0.11 |
40,000–50,000 | 0.25 | 0.23 |
50,000–60,000 | 0.22 | 0.24 |
60,000–70,000 | 0.14 | 0.18 |
70,000–80,000 | 0.08 | 0.12 |
80,000–90,000 | 0.04 | 0.07 |
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