Paper: CSIR-NET June 2018 · Subject: Physical Chemistry · Chapter: Polymer Chemistry · Topic: Polymer Chemistry – General · Marks: 2 · Difficulty: Medium
A $5 \mathrm{g} / \mathrm{L}$ polymer solution is prepared with a polymer whose molar mass is 25 kg the osmotic pressure (in atm) of this solution at 25°C is (consider $\mathrm{RT}=2500 \mathrm{J} \mathrm{mol}^{-1}$ )
(a)0.002
(b)0.05
(c)0.005
(d)0.008
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
c = 5 g L⁻¹ / 25,000 g mol⁻¹ = 2×10⁻⁴ mol L⁻¹ = 0.2 mol m⁻³; π = cRT = 0.2 × 2500 = 500 Pa ≈ 0.005 atm.