Exam-style question
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A gas occupies a volume of 0.5 m³ at a pressure of 200,000 Pa. Calculate the number of moles of the gas at a temperature of 300 K using the ideal gas equation. Scenario focus: use circular motion in a distinct A-Level Physics context and identify the relevant physical quantity before choosing the answer.
Model answer
What a good answer should say
- The number of moles of the gas is 4.00 mol.
Explanation
Why this works
The correct answer is The number of moles of the gas is 4.00 mol.. This option is correct for Thermal physics because it applies the circular motion idea in the stem and keeps the relevant quantity, unit, and physical conclusion together.
The alternatives either use a neighbouring formula, omit a required variable, or describe a different physical situation.
Common mistake
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