The following table lists molecular weight data for a polypropylene material.
Compute,
a) the number-average molecular weight
b) the weight-average molecular weight
c) the degree of polymerization.
| Molecular Weight Range (g/mol) | xi | wi |
|---|---|---|
| 8,000-16,000 | 0.05 | 0.02 |
| 16,000-24,000 | 0.16 | 0.10 |
| 24,000-32,000 | 0.24 | 0.20 |
| 32,000-40,000 | 0.28 | 0.30 |
| 40,000-48,000 | 0.20 | 0.27 |
| 48,000-56,000 | 0.07 | 0.1 |