Question detail
If 2 moles of a gas occupy a volume of 48 dm³ at room temperature and pressure, what is the molar volume of the gas?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Kinetics
Question
- A. 24 dm³
- B. 12 dm³
- C. 48 dm³
- D. 36 dm³
Answer
24 dm³
Explanation
To find the molar volume, we use the formula: volume = moles x 24 dm³. Here, moles = 2, so volume = 2 moles x 24 dm³ = 48 dm³. Therefore, molar volume = 48 dm³ / 2 moles = 24 dm³.
Common mistake
Misunderstanding Concentration Effects
Students often confuse concentration with the total amount of substance, leading to incorrect conclusions about how concentration affects reaction rate.
To correctly explain how concentration affects collision frequency and rate, use the formula for collision frequency: collision frequency ∝ concentration. For example, if the concentration of reactants is doubled, the collision frequency also doubles, leading to an increased reaction rate. Therefore, if the initial concentration is 0.5 mol/dm³ and the new concentration is 1.0 mol/dm³, the substitution would be: collision frequency ∝ 1.0 mol/dm³ / 0.5 mol/dm³ = 2. The answer is that the collision frequency doubles, which increases the rate of reaction.
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