Question detail
In the equation for calculating the volume of a gas at room temperature and pressure, how can you rearrange the formula to find the amount of substance in moles if the volume is known?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Use of amount of substance in relation to volumes of gases (chemistry only) (HT only)
Question
In the equation for calculating the volume of a gas at room temperature and pressure, how can you rearrange the formula to find the amount of substance in moles if the volume is known?
Answer
To find the amount of substance in moles (n), you can rearrange the formula for gas volume, V = n × 24 dm³, to n = V / 24 dm³. This shows that the amount in moles is equal to the volume divided by 24 dm³.
Explanation
This question tests the student's understanding of rearranging equations related to gas volume calculations. It assesses their ability to manipulate the formula correctly.
Common mistake
Changing the Subject of Equations
Students often forget to isolate the variable correctly when changing the subject of gas-volume equations, leading to incorrect formulas.
To fix this, practice rearranging equations step-by-step, ensuring each operation is applied to both sides of the equation to maintain balance.
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