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Molecular Weight of Polymers

In a polymer ...

Question

In a polymer sample 30% of molecules have a molecular mass of 20,000, 40% have 30,000 and the rest 60,000. What is the weight average molecular mass of the polymer?(1) 40,300 (2) 30,600 (3) 43,333 (4) 50,400.

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of a polymer containing 30% molecules with molecular mass 20,000, 40% have 30,000 and the rest have 60,000 is

30 %

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({¯ M}_{n})

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