Question detail
If 3.0 g of sodium chloride (NaCl) is dissolved in enough water to make 0.5 dm3 of solution, what is the concentration of the solution in mol/dm3? (Mr of NaCl = 58.5 g/mol)
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
If 3.0 g of sodium chloride (NaCl) is dissolved in enough water to make 0.5 dm3 of solution, what is the concentration of the solution in mol/dm3? (Mr of NaCl = 58.5 g/mol)
Answer
The answer is 0.102 g. 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 uses Concentration in g/dm3 because the objective is about (chemistry only) (HT only) Calculate amount in moles of solute from concentration in mol/dm3 and volume. The reasoning belongs to Concentrations in mol/dm3 and titration calculations within Using concentrations of solutions in mol/dm3 (chemistry only) (HT only), so it should not be confused with nearby quantitative ideas such as mass, moles, concentration, yield, atom economy, or gas volume unless those are named in the objective. Use the focus term chemistry only to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.3.
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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