Question detail
What is the concentration in g/dm³ of a solution containing 5 grams of solute in 0.5 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. 10 g/dm³
- B. 5 g/dm³
- C. 2 g/dm³
- D. 20 g/dm³
Answer
10 g/dm³
Explanation
The correct option is 10 g/dm³. Use Concentration in g/dm3: concentration = mass / volume. The worked result is 10 g. 10 g/dm³ is the best answer because it directly supports the AQA A-Level Chemistry objective to calculate amounts using particle number and the Avogadro constant. This reasoning is anchored to The mole and the Avogadro constant in Amount of substance, and it separates Avogadro constant from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Common Mistake in Avogadro Constant Calculations
Students often forget to convert the particle number to moles using the Avogadro constant before performing calculations.
To fix this, remember the formula: n = N / L, where n is the number of moles, N is the number of particles, and L is the Avogadro constant (6.022 x 10^23 mol^-1). For example, if you have 1.2044 x 10^24 particles, substitute: n = 1.2044 x 10^24 / 6.022 x 10^23 = 2.00 moles.
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