Which of the following solutions contains the same number of moles of KCl as 75.00 mL of a 0.250 M solution of KCl?

• A. 150.0 mL of 0.125 M KCl
• B. 50.0 mL of 0.375 M KCl
• C. 100.0 mL of 0.125 M KCl
• D. 25.0 mL of 0.750 M KCl

Answer: (B)

Verified step by step guidance

1. Identify the given solution's volume and molarity: 75.00 mL and 0.250 M KCl.
2. Calculate the number of moles of KCl in the given solution using the formula \(\text{moles} = M \times V\), where \(M\) is molarity and \(V\) is volume in liters. Convert 75.00 mL to liters by dividing by 1000.
3. For each of the other solutions, convert their volumes from mL to liters and calculate the moles of KCl using the same formula \(\text{moles} = M \times V\).
4. Compare the moles of KCl calculated for each solution to the moles from the original 75.00 mL of 0.250 M solution to find which one matches exactly.
5. Select the solution whose calculated moles of KCl are equal to the moles in the original solution, confirming it contains the same number of moles of KCl.