Calculate the molarity of a solution prepared by dissolving 5.00 g of potassium chloride (KCl) in enough water to make 250.0 mL of solution.
Answer
M = 0.268 mol L⁻¹
The correct answer is M = 0.268 mol L⁻¹ — State the final answer.
Step-by-step solution
- Find the molar mass of KCl: M(KCl) = 39.10 + 35.45 = 74.55 g mol⁻¹.
- Convert the mass of KCl to moles: n = 5.00 g / 74.55 g mol⁻¹ = 0.0671 mol.
- Convert the solution volume to litres: V = 250.0 mL = 0.250 L.
- Molarity M = n / V = 0.0671 mol / 0.250 L = 0.268 mol L⁻¹.
- State the final answer.
Common mistake: Forgetting to convert millilitres to litres before dividing.
Concept tested: Molarity calculation
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