The osmotic pressure ($\Pi$) of a solution is related to its molar concentration ($C$) and temperature ($T$) by the equation: $\Pi = CRT$ .

Given: Osmotic Pressure ($\Pi$) = $0.0821 \text{ atm}$ Temperature ($T$) = $300 \text{ K}$

• Gas Constant ($R$) $\approx 0.0821 \text{ L atm K}^{-1} \text{ mol}^{-1}$ (This value is standard for pressure in atm, consistent with the provided data).

Rearranging the formula to solve for concentration ($C$): $C = \frac{\Pi}{RT}$

Substituting the values: $C = \frac{0.0821}{0.0821 \times 300}$ $C = \frac{1}{300}$ $C \approx 0.00333 \text{ mol L}^{-1}$

Converting to scientific notation to match the options: $C = 0.33 \times 10^{-2} \text{ mol L}^{-1}$