FRQ — Some Basic Concepts of Chemistry

Short answer·Standard multi-step (3/5)·Calculator allowed

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 bottle label reads:

20\%

by mass

\mathrm{NaOH}

solution, density

1.20\text{ g mL}^{-1}

Total: 4 marks

(a) Find the mass of $1.00\text{ L}$ of the solution. (1 mark)

(b) Find the mass and moles of $\mathrm{NaOH}$ in $1.00\text{ L}$ solution. (2 marks)

Your response (optional — you can also work on paper)

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