Question

A solution of 8 g of a certain organic compound in 2 dm³ water develops osmotic pressure 0.6 atm at 300 K. Calculate the molar mass of compound. [R = 0.082 atm dm^3 K^{-1} mol^{-1}]

• A. $148\ \text{g mol}^{-1}$
• B. $164\ \text{g mol}^{-1}$
• C. $172\ \text{g mol}^{-1}$
• D. $180\ \text{g mol}^{-1}$

Hint:

Key Exam Tip:
The van't Hoff equation ($\pi = CRT$) is fundamental for osmotic pressure calculations. Ensure that volume is in liters or dm³ and temperature is in Kelvin. Molar mass is calculated using $M = \frac{mRT}{\pi V}$.

Answer 1

The Correct Option is B