Question detail
A solution has a concentration of 2.5 mol/dm3. How many moles of solute are present in 0.4 dm3 of this solution?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Using concentrations of solutions in mol/dm3 (chemistry only) (HT only)
Question
A solution has a concentration of 2.5 mol/dm3. How many moles of solute are present in 0.4 dm3 of this solution?
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
This question tests the ability to calculate the amount in moles of solute using the concentration and volume of the solution. The calculation involves using the formula for concentration to find the moles. 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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