FRQ — Organic Chemistry: Some Basic Principles and Techniques

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

On combustion,

0.30\text{ g}

of an organic compound gives

0.44\text{ g}

\mathrm{CO_2}

and

0.18\text{ g}

\mathrm{H_2O}

Total: 6 marks

(a) Find the mass of carbon in the sample. (2 marks)

(b) Find the mass of hydrogen in the sample. (2 marks)

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

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