Mass-average molecular mass of a polymer is determined by:

Number-average molecular mass of a polymer is determined by:

Number-average molecular mass of a polymer is determined by:

Statement 1: Mbar(n) (number -average molecular mass) of a polymer is determined by osmotic pressure method,while Mbar(w) (weight -average molecular mass)is determined by ultracentrifuge method. Statement 2:Osmotic pressure is a colligative property.

Statement 1: Mbar(n) (number -average molecular mass) of a polymer is determined by osmotic pressure method,while Mbar(w) (weight -average molecular mass)is determined by ultracentrifuge method. Statement 2:Osmotic pressure is a colligative property.

The number average molecular mass and mass average molecular mass of a polymer are respectively 30,000 and 40,000. The poly dispersity of the polymer is: