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CBSE Class 12-science Answered

A polymer sample contains 30%(by weight) of chains with molecular weight 10000, 30%(by weight) of the chains with molecular weight 20000, and the rest of chains with molecular weight 30000. Calculate the number average and weight average molecular weight of the sample.

Asked by me.shekharhimanshu | 19 Jun, 2020, 12:03: PM
Expert Answer
The space average space molecular space mass space of space the space polymer colon
straight M equals fraction numerator sum for blank of straight M subscript straight i straight N subscript straight i over denominator sum for blank of straight N subscript straight i end fraction space equals space fraction numerator 30 left parenthesis 10000 right parenthesis plus 30 left parenthesis 20000 right parenthesis plus 40 left parenthesis 30000 right parenthesis over denominator 30 plus 30 plus 40 end fraction space space space equals space space space fraction numerator 300000 plus 600000 plus 1200000 over denominator 100 end fraction
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space space 2100000 over 100 space space equals space space 21000
 

The number average molecular mass of the polymer is 21,000.

Answered by Ramandeep | 19 Jun, 2020, 01:29: PM
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