Provided that in molecular weight determinations by vapor pressure osmometry (VPO) the relationship between M and the measured quantity (δ V / c ) c =0 obeys a calibration function of the type (δ V / c ) c =0 = KM −a , the kind of molecular weight average M̄ VPO delivered by this method is derived. The deviation of M̄ VPO from the true number average molecular weight M̄ n is estimated from its dependence on the polydispersity and the exponent a of the calibration function.
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Rubén V. Figini (1980) studied this question.
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