Question detail
What is the amount in moles of solute in a solution with a concentration of 2.5 mol/dm3 and a volume of 0.4 dm3?
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. 1.0 mol
- B. 1.5 mol
- C. 2.0 mol
- D. 2.5 mol
Answer
1.0 mol This answer should be checked against the named quantitative relationship, the balanced equation where relevant, and the final unit required by the question.
Explanation
The amount in moles can be calculated using the formula: moles = concentration x volume. Here, moles = 2.5 mol/dm3 x 0.4 dm3 = 1.0 mol. In exam marking, the important steps are to identify the correct relationship, substitute or interpret the values carefully, keep units consistent, and avoid mixing this calculation with neighbouring Unit 4.3 methods.
Common mistake
Common Mistake in Moles Calculation
Students often forget to convert the volume from cm3 to dm3 when calculating moles from concentration.
Always convert the volume to dm3 by dividing cm3 value by 1000 before using it in the calculation.
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