Question detail
If 12 g of NaCl is dissolved in enough water to make 0.5 dm³ of solution, what is the concentration in g/dm³?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
- A. 24 g/dm³
- B. 20 g/dm³
- C. 30 g/dm³
- D. 18 g/dm³
Answer
24 g/dm³
Explanation
Concentration is calculated using the formula: concentration = mass / volume. Here, concentration = 12 g / 0.5 dm³ = 24 g/dm³.
Common mistake
Misunderstanding Concentration Units
Students often confuse grams per cubic decimetre (g/dm^3) with other units of concentration, such as moles per cubic decimetre (mol/dm^3).
To fix this, students should practice converting between different concentration units and always check which unit is required for the specific calculation.
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