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In a polymer sample, 30% of molecules ha...

In a polymer sample, `30%` of molecules have a molecualr mass of `20,000, 40%` have 30,000 and the rest 60,000. What is the weight average molecular mass of the polymer?

A

40300

B

30600

C

43333

D

33353

Text Solution

Verified by Experts

The correct Answer is:
C
`P.D.I= ( bar(M_w))/(bar(M_n)) gt 1`
`bar(M_w)=(30(20000)^(2)+40(30000)^(2)+30(60000)^(2))/((30xx20000)+(40xx 30000)+(30xx 60000))`
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