Question

The following table lists molecular weight data for a polypropylene material.

Molecular Weight Range (g/mol)		xi		wi
8,000 - 16,000		0.06		0.02
16,000 - 24,000		0.16		0.11
24,000 - 32,000		0.26		0.19
32,000 - 40,000		0.27		0.28
40,000 - 48,000		0.18		0.29
48,000 - 56,000		0.07		0.11

Click here to access Table 14.3.

Atomic weights for several elements are included in the following table:

Carbon	12.01 g/mol
Chlorine	35.45 g/mol
Fluorine	19.00 g/mol
Hydrogen	1.008 g/mol
Oxygen	16.00 g/mol
Nitrogen	14.01 g/mol

Compute the following:

(a) the number-average molecular weight,

g/mol

(b) the weight-average molecular weight,

g/mol

(c) the degree of polymerization.

Answer 1