Discussion
The number average molecular weight of a polymer can be determined by :
Answer: A
The number average molecular weight can be determined by vapour pressure osmometry.
Colligative methods, such as vapour pressure osmometry, membrane osmometry, boiling point elevation and freezing point depression, depend on the number of solute molecules present, not on their size. Dividing the mass of polymer by the number of molecules counted in this way gives the number average molecular weight, Mn.
Light scattering responds more strongly to larger molecules and gives the weight average Mw. Sedimentation equilibrium gives Mw or the z-average Mz, and solution viscosity gives the viscosity average Mv.
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