at a temperature of 5 celsius, 21.5 mg of a non electrolyte is dissolved in enough water to make a 150.0 ml solution. the osmotic pressure of the solution is 0.200 atm. what is the molar mass of the substance dissolved

Answer 1

pi = MRT
Substitute and solve for M.

Then M = mols/L. You know M and L, solve for mols.

Then mols = grams/molar mass. You know mols and grams, solve for molar mass.