Practice question
Question
A solution containing 0.1 mole of a non-volatile solute in 1 kg of water has an osmotic pressure of 2.46 atm at 27°C. What is the van’t Hoff factor? ( R = 0.0821 L atm mol⁻¹ K⁻¹ , assume 1 L solution)
Explanation
Pi = i · M · RT . Molarity ≈ molality for dilute solution, so M = 0.1 M . 2.46 = i × 0.1 × 0.0821 × 300 . i = (2.46/0.1 × 0.0821 × 300) ≈ 1 .
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