The following masses of four poly(methylacrylate) samples with given molar masses are blended. m, [g] m. mod 70 50,000 Sample A Sample B Sample C Sample D 60 90 75 100,000 150,000 200,000 a) Calculate the number average molar mass (Mn) of the blend. (5 pts) b) Calculate the average number of repeating units by number (In) of the blend. (5 pts) c) Calculate the weight average molar mass (Mw) of the blend. (5 pts) d) Calculate the average number of repeating units by weight (Xw) of the blend. (5 pts) e) Calculate the polydispesity index (PDI) of the blend. (5 pts)