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+//Section-1,Example-7,Page no.-AC.36
+//To calculate number average(Mn_bar) and weight average molecular mass(Mw_bar)of polypropylene polymer 
+clc;
+M1=[(12*3)+(6*1)]*400 //molecular mass of (a)
+M2=[(12*3)+(6*1)]*800 //molecular mass of (b)
+M3=[(12*3)+(6*1)]*600 //molecular mass of (c)
+n1=25
+n2=35
+n3=40
+Mn_bar=((n1*M1)+(n2*M2)+(n3*M3))/(n1+n2+n3)
+disp(Mn_bar,'number average molecular mass')
+Mw_bar=((n1*M1^2)+(n2*M2^2)+(n3*M3^2))/((n1*M1)+(n2*M2)+(n3*M3))
+disp(Mw_bar,'weight average molecular mass')
+
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