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Suppose that you have a blend of polymer molecules of two different molecular weights: M A = 5 0 , 0 0 0 and M

Suppose that you have a blend of polymer molecules of two different

molecular weights:

M_{A} = 50, 000

and

M_{B} = 120, 000 D a .

If the

number

-

average molecular weight is

65, 000 D a,

what is the mole

fraction

x

of each type?

x_{A} =

x_{B} =

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