Question

The osmotic pressure of a 0.1 M solution of NaCl at \(27^\circ\)C is (\(R=0.082\) L atm mol\(^{-1}\) K\(^{-1}\)):

• A. 4.92 atm
• B. 2.46 atm
• C. 9.84 atm
• D. 0.492 atm

Hint:

Electrolytes require van’t Hoff factor.

Answer 1

The Correct Option is A

NaCl dissociates into 2 ions, so \(i=2\). \[ \pi=iMRT=2\times0.1\times0.082\times300=4.92\ \text{atm} \]