ChemistryCalculate the number average molecular mass Mn¯ and weight average molecular mass Mw¯ of a polymer in which 30% molecules have a molecular mass 20,000; 40% have 30,000 and the rest 30% have 60,000.

Calculate the number average molecular mass Mn¯ and weight average molecular mass Mw¯ of a polymer in which 30% molecules have a molecular mass 20,000; 40% have 30,000 and the rest 30% have 60,000.

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    Solution:

    The polymer contains n1=30,M1=20,000; n2=40,M2=30,000 and n3=30,M3=60,000

    So, Mn¯=n1M1+n2M2+n3M3n1+n2+n3

               =30×20,000+40×30,000+30×60,00030+40+30=10,000(60+120+180)100=36,000

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