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Long answer·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

5.85 g5.85\,\mathrm{g} of NaCl\mathrm{NaCl} is dissolved in 500 g500\,\mathrm{g} water. The final volume of the solution is 505 mL505\,\mathrm{mL}. Use M(NaCl)=58.5 g mol−1M(\mathrm{NaCl})=58.5\,\mathrm{g\,mol^{-1}}.
Total: 4 marks

(a) Calculate the molality of NaCl\mathrm{NaCl}. (1 mark)

(b) Calculate the mole fraction of NaCl\mathrm{NaCl}. (2 marks)

(c) Calculate the molarity of NaCl\mathrm{NaCl}. (1 mark)

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cbse-chemistry-12.u1.t1-1.laq.004

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