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  4. The number average molecular mass and mass average molecular mass of a polymer are respectively 30,000 and 40,000. The poly dispersity index of the polymer is

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Q. The number average molecular mass and mass average molecular mass of a polymer are respectively 30,000 and 40,000. The poly dispersity index of the polymer is

Polymers

Solution:

Poly dispersity index (PDI) of the polymer
$=\frac{\bar{M_w}}{\bar{M}_n} = \frac{40000}{30000} = 1.33$