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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:

KEAMKEAM 2005

Solution:

$ PDi=\frac{{{\overline{M}}_{w}}}{{{\overline{M}}_{n}}}=\frac{40,000}{30,000} $ So, the value is more than 1.