Question

An aqueous solution of volume \( V \) ml contains a non-volatile solute of unknown mass \( W_B \) g and molar mass \( M_B \) g/mol. If the Osmotic pressure of the solution is \( 1.013 \) bar, which one of the following is the mathematical expression to be used to calculate \( W_B \)?

• A. \( W_B = \frac{\pi M_B V}{760RT \times 1000} \)
• B. \( W_B = \frac{\pi M_B V \times 1000}{76RT} \)
• C. \( W_B = \frac{\pi M_B V}{RT} \)
• D. \( W_B = \frac{\pi M_B V}{1000RT} \)

Hint:

Always convert volume to litres when using osmotic pressure formula \( \pi = CRT \).

Answer 1

The Correct Option is D