3 mol of solute is dissolved to make 1.5 dm^3 of solution. What is its concentration?
Answer and explanation
Correct answer: A. 2 mol/dm^3
- Step 1: Concentration c = n / V.
- Step 2: c = 3 / 1.5 = 2 mol/dm^3.
Answer
2 mol/dm^3.
Why not the others: '4.5 mol/dm^3' multiplies moles by volume; '0.5 mol/dm^3' divides volume by moles; '3 mol/dm^3' adds one to the concentration.
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