Question

In a polymer, there are 100 molecules of molecular weight 100, 200 molecules
of molecular weight 1000 and 300 molecules of molecular weight 10,000. Find
Mwand M, and PDI.​

Answer 1

Answer:

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Answer 2

The average molecular weight is 5350, the total number of molecules is 600, and the degree of polymerization is 8.91

Explanation:

100 molecules of molecular weight 100

200 molecules of molecular weight 1000

300 molecules of molecular weight 10000

Number of Average molecular weight$=\frac{M1N1+M2N2+M3N3}{N1+N2+N3}$

= $\frac{(100)(100)+(200)(1000)+(300)(10000)}{100+200+300}$

=5350 is the average molecular weight

and the total number of molecules is 600

• The degree of polymerization (Dp) is equal to the number of monomeric units in a macromolecule or polymer molecule.
• It is equal to $\frac{Mn}{Mo}$ where Mn is the number average molecular weight and Mo is the molecular weight.

Dp =$\frac{5350}{600}$

The degree of polymerization is calculated as 8.91