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Long answer·Hard exam skill (4/5)·No calculator

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

A 0.90% (w/V) NaCl0.90\%\,(w/V)\ \mathrm{NaCl} solution is used as saline. Estimate its osmotic pressure at 300 K300\,\mathrm{K} if the effective van't Hoff factor of NaCl\mathrm{NaCl} is 1.851.85. Use M(NaCl)=58.5 g mol−1M(\mathrm{NaCl})=58.5\,\mathrm{g\,mol^{-1}} and R=0.0821 L atm K−1 mol−1R=0.0821\,\mathrm{L\,atm\,K^{-1}\,mol^{-1}}.
Total: 4 marks

(a) Convert 0.90% (w/V)0.90\%\,(w/V) into molarity. (2 marks)

(b) Calculate osmotic pressure using the effective ii. (2 marks)

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cbse-chemistry-12.u1.t1-4.laq.004

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