Question

Calculate the molecular weight of cellulose acetate if its 0.2% (w/vol)
solution in acetone (sp. gr. 0-8) shows an osmotic rise of 23-1 mm against pure
acetone at 27°C.​

Answer 1

||☆☆Question☆☆||

Calculate the molecular weight of cellulose acetate if its 0.2% (w/vol)

solution in acetone (sp. gr. 0-8) shows an osmotic rise of 23-1 mm against pure

acetone at 27°C.

||☆☆Answer☆☆||

One should simply use the formula,

Osmotic pressure = concentration * R* T

Since the wt/vol % of the solution is given, one can easily find the concentration of solution in the terms of molarity of the solution.

Please do take care to use the units of R accordingly as the pressure is given in terms of mm of Hg.