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Case study·Standard multi-step (3/5)·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

Normal saline is labelled 0.90% (w/V) NaCl0.90\%\,(w/V)\ \mathrm{NaCl}, meaning 0.90 g NaCl0.90\,\mathrm{g}\ \mathrm{NaCl} per 100 mL100\,\mathrm{mL} solution. Take M(NaCl)=58.5 g mol−1M(\mathrm{NaCl})=58.5\,\mathrm{g\,mol^{-1}} and assume the density is approximately 1.00 g mL−11.00\,\mathrm{g\,mL^{-1}}.
Total: 4 marks

(a) Find the mass of NaCl\mathrm{NaCl} in 500 mL500\,\mathrm{mL} saline. (1 mark)

(b) Find its approximate molarity. (2 marks)

(c) Find its approximate molality. (1 mark)

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cbse-chemistry-12.u1.t1-1.case.005

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