Question detail
If 2 moles of a gas occupy a volume of 50 dm³ at a temperature of 300 K, what is the pressure of the gas? (Use R = 8.31 J/(mol·K))
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Amount of substance
Question
- A. 0.497 kPa
- B. 0.497 atm
- C. 0.497 Pa
- D. 0.497 kJ
Answer
0.497 kPa
Explanation
The correct option is 0.497 kPa. Use Ideal Gas Equation: pV = nRT. The worked result is 0.497 Pa. 0.497 kPa is the best answer because it directly supports the AQA A-Level Chemistry objective to use pV = nRT in calculations involving gases. This reasoning is anchored to The ideal gas equation in Amount of substance, and it separates involving from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Incorrect Rearrangement of Ideal Gas Equation
Students often incorrectly rearrange the ideal gas equation pV = nRT, leading to wrong calculations of pressure, volume, or temperature.
To correctly rearrange the ideal gas equation, identify the variable you need to isolate. For example, to find volume (V), use V = nRT/p. Substitute the known values into the equation, perform the calculations, and ensure your final answer includes the correct units (dm³ for volume).
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