Polydispersity index is defined as ______ where Mw and Mn are the weight average and number average molecular masses respectively.

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1.	Polydispersity index is defined as ______ where Mw and Mn are the weight average and number average molecular masses respectively.
A.	Mw x Mn
B.	Mw/Mn
C.	Mn/Mw
D.	Mw – Mn
Answer» C. Mn/Mw

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