Which solution has the same number of moles of KCl as 75.00 mL of 0.250 M solution of KCl?
A)20.0 mL of 0.200 M solution of KCl
B)25.0 mL of 0.175 M solution of KCl
C)129.3 mL of 0.145 M solution of KCl
D)50.0 mL of 0.125 M solution of KCl
E)100 mL of 0.0500 M solution of KCl

Question

Quizplus · Accepted Answer

To solve this problem, we need to use the formula:

moles of solute = concentration x volume (in liters)

First, we need to find the number of moles of KCl in 75.00 mL of 0.250 M solution:

moles of KCl = 0.250 M x 0.07500 L = 0.01875 mol

Next, we can use this value to determine which solution has the same number of moles of KCl:

moles of KCl = 0.145 M x 0.1293 L = 0.01874 mol

The answer is choice C because it has a volume that is closest to 129.3 mL, and its concentration is such that the number of moles of KCl is very close to the number of moles in the original solution. The other choices either have concentrations that are too low (A, B, E) or volumes that are too high (D) to match the number of moles.

Which Solution Has the Same Number of Moles of KCl