Question

Determine the molecular mass of a solution if prepared by dissolving 6.00 g of an unknown nonelectrolyte in enough water to make 1.00 L of solution. The osmotic pressure of this solution is 0.750 atm at 25.0 °C.
pi = MRT
0.750 = M*0.0821*(273+25)
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. Post your work if you get stuck.

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