Question detail
If a solution has a concentration of 2 mol/dm3 and you have 0.5 dm3 of it, how many moles of solute are present?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Using concentrations of solutions in mol/dm3 (chemistry only) (HT only)
Question
- A. 1 mol
- B. 0.5 mol
- C. 2 mol
- D. 0.25 mol
Answer
1 mol
Explanation
The number of moles can be calculated using the formula moles = concentration x volume. Here, moles = 2 mol/dm3 x 0.5 dm3 = 1 mol.
Common mistake
Misunderstanding Concentration Relationships
Students often confuse the relationship between concentration, mass of solute, and volume of solution, thinking that concentration is solely dependent on mass without considering volume.
To fix this, remember that concentration in mol/dm3 is calculated by dividing the mass of solute (in grams) by the volume of solution (in dm3). Always consider both mass and volume when discussing concentration. Keep the correction anchored to Concentrations in mol/dm3 and titration calculations; check formula, substitution, calculation, final answer, and unit where relevant.
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