FRQ — Thermodynamics

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 cylinder contains

0.50\text{ mol}

of an ideal gas in volume

1.0\times10^{-2}\text{ m}^3

300\text{ K}

. Take

R=8.3\text{ J mol}^{-1}\text{K}^{-1}

. The volume is then kept constant and the gas is heated to

450\text{ K}

Total: 4 marks

(a) Find the initial pressure. (1 mark)

(b) Find the final pressure. (1 mark)

(d) State why absolute temperature, not Celsius temperature, is used. (1 mark)

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

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