Question

The following table lists molecular weight data for a polypropylene material. Compute (a) the number-average molecular weight, (b) the weight-average molecular weight, and (c) the degree of polymerization. please show equations and calculations used. thank you

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 0.11

Answer #1

Molecular weight data for some polymer are tabulated.
Determine:
a) The number-average molecular weight
b) The weight-average molecular weight
c) What is the number-average degree of polymerization for this
polymer?
d) What is the weight-average degree of polymerization for this
polymer?
Molecular Weight
Range (g/mol)
xi
wi
8,000-16,000
0.05
0.02
16,000-24,000
0.20
0.10
24,000-32,000
0.20
0.25
32,000-40,000
0.25
0.25
40,000-48,000
0.23
0.20
48,000-56,000
0.07
0.18

One of the large photocopiers used by a printing company has a
number of special functions unique to that particular model. This
photocopier generally performs well but, because of the complexity
of its design and the frequency of usage, it occasionally breaks
down. The department has kept records of the number of breakdowns
per month over the last fifty months. The data is summarized in the
table below:
Number of Breakdowns
Probability
0
0.12
1
0.32
2
0.24
3...

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