Question detail
What is the concentration in mol/dm3 of a solution containing 5 moles of solute in 2 dm3 of solution?
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. 2.5 mol/dm3
- B. 5 mol/dm3
- C. 10 mol/dm3
- D. 0.5 mol/dm3
Answer
2.5 mol/dm3
Explanation
To calculate concentration, we use the formula: concentration = moles / volume. Here, we have 5 moles of solute in 2 dm3 of solution. Substituting the values, concentration = 5 moles / 2 dm3 = 2.5 mol/dm3. Thus, the concentration is 2.5 mol/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.
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