c) Discuss Benoit's finding of the universal calibration principal, and how this allows GPC to be used to measure polymer MW's. d) If the retention volume for a monodisperse polyethylene oxide (PEC) sample of 60,000 g/mol is 100 ml in water at 25C, what is the molecular weight of a fraction of poly acrylic acid (PAA) at the same elution volume for the same experimental conditions? The Mark-Houwink parameters, for PEO are K-7.54 x 10 ml/g and a = 0.79. For PAAK = 16.3 x 10 ml/g and a = 0.74