Question detail
If you have 3 moles of a gas at standard temperature and pressure (STP), what is the volume of the gas in dm3?
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. 72 dm3
- B. 60 dm3
- C. 48 dm3
- D. 24 dm3
Answer
72 dm3
Explanation
At STP, 1 mole of gas occupies 24 dm3. To find the volume of 3 moles, we use the formula: volume = moles x 24 dm3. Substituting the values, we have: volume = 3 moles x 24 dm3/mole = 72 dm3. Therefore, the volume of the gas is 72 dm3.
Common mistake
Misunderstanding the Avogadro Constant
Students often confuse the Avogadro constant with the number of moles instead of recognizing it as the number of particles in one mole.
To clarify, remember that the Avogadro constant (6.022 x 10^23) represents the number of atoms, molecules, or ions in one mole of a substance. When calculating the number of particles, use the formula: number of particles = moles × Avogadro constant. For example, if you have 2 moles of a substance, the calculation would be: 2 moles × 6.022 x 10^23 particles/mole = 1.2044 x 10^24 particles.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.