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Number average molecular mass of a polym...

Number average molecular mass of a polymer that contains 15 molecules with each of mass, 8,000 and 15 molecules with each of mas 80,000 is

A

22000

B

33000

C

11000

D

44000

Text Solution

Verified by Experts

The correct Answer is:
D
Number average molecular mass of polymer is given by formula :
`M_(n) = (Sigma N_(i)M_(i))/(Sigma N_(i))`
`= (15 xx 8000 + 15 xx 80,000)/(30)`
`= (120000 + 1200000)/(30)`
`=(1320000)/(30) = 44,000`
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