1.

Calaulate the average molecules mass of a polymer sample in which`30%`molecules have a molecular mass of`20,000,40%`have`30,000`,and the rest`30%`have`60,000`

Answer» `Mbar(n)`and`Mbar(w)`of this sample will be
`Mbar(n)=((30xx20,000)+(40xx30,000)+(30xx60,000))/(30+40+30)`
`=36000`
`Mbar(w)=(30(20,000)^(2)+40(30,000)^(2)+30(60,000)^(2))/(30xx20,000+40xx30,000+30xx60,000)`
`=43333`


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