Calculate the osmotic pressure exerted by a 0.020 M aqueous solution of sucrose at 27 °C (300 K), given R = 0.0821 L atm / (mol K).
Answer and explanation
Correct answer: B. 0.493 atm
- Step 1: Osmotic pressure: Pi = i M R T. Step 2. For non-electrolyte sucrose, van 't Hoff factor i = 1. Step 3. Pi = 1 (0.020 mol/L) (0.0821 L atm / mol K) (300 K) = 0.4926 atm = 0.493 atm. Answer: 0.493 atm. Why not the others: 4.93 atm results from a factor of 10 error; 0.246 atm from using 150 K.
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