What is the molarity of a solution prepared by dissolving 1.0 mol of KCl in 2000 mL of solution?

• A. 1.0 M
• B. 0.50 M
• C. 0.20 M
• D. 2.0 M

Answer: (B)

Verified step by step guidance

1. Identify the formula for molarity, which is the number of moles of solute divided by the volume of the solution in liters: \(M = \frac{\text{moles of solute}}{\text{volume of solution in liters}}\).
2. Note the given values: moles of KCl = 1.0 mol, and volume of solution = 2000 mL.
3. Convert the volume from milliliters to liters because molarity requires liters: \$2000\ \text{mL} = \frac{2000}{1000} = 2.0\ \text{L}$.
4. Substitute the values into the molarity formula: \(M = \frac{1.0\ \text{mol}}{2.0\ \text{L}}\).
5. Calculate the molarity by dividing the moles by the volume in liters to find the concentration of the KCl solution.