[madscientist]

Hi fellow chem freaks lol,

I have a question that i have answered allready but am not confident with my answer,

the question states:The osmotic pressure of 1.50 g of polymethyl methacrylate dissolved in enough methylbenzene to produce 175 mL of solution was 2.11 kPa at 20°C.  Calculate the average molar mass of the sample of polymethyl methacrylate.

my  is: 9.901 * 10^3 g/mol

[GCT]

Hi, you'll need to show your work first.  You know the formula for osmotic pressure...use the correct units and solve for molarity (or is it molality?).  From the given information (1.50 grams, and 175 mL of solution) you should be able to find the molar mass.