Answer
26.1 atm
Work Step by Step
Molarity, M= Number of moles of solute$\div$ Volume of solution in L $=\frac{(24.6\div92.1)mol}{.250 L}$.
Gas constant, R = $0.0821 L atm K^{-1} mol^{-1}$.
Temperature, T= 298 K.
Recall that osmotic pressure, Π= MRT=$\frac{(24.6\div92.1)mol}{.250 L}\times0.0821 L atm K^{-1} mol^{-1}\times298K= 26.1 atm$
