Question detail
Calculate the volume of 2 moles of an ideal gas at standard temperature and pressure (STP).
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. 44.8 dm3
- B. 48 dm3
- C. 22.4 dm3
- D. 11.2 dm3
Answer
44.8 dm3
Explanation
The correct option is 44.8 dm3. Use Gas Volume at Room Temperature and Pressure: volume = moles x 24 dm3. The worked result is 44.8 dm3. 44.8 dm3 is the best answer because it directly supports the AQA A-Level Chemistry objective to rearrange the ideal gas equation to calculate pressure, volume, amount, gas constant or temperature where appropriate. This reasoning is anchored to The ideal gas equation in Amount of substance, and it separates ideal gas equation 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
Rearranging the Ideal Gas Equation
Students often forget to convert all values to SI units before using the ideal gas equation, leading to incorrect calculations.
Always convert pressure to Pascals (Pa), volume to cubic meters (m³), and temperature to Kelvin (K) before substituting values into the ideal gas equation (pV = nRT). For example, if given pressure in atm, convert it to Pa using the conversion 1 atm = 101325 Pa.
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