Problem: How many mL of a 0.155 M KCl solution contain 2.55 g KCl?

We have to determine the volume of 0.155 M KCl solution (in mL) that contains 2.55 g KCl

Molarity is a unit to express solution concentration. It is defined as the number of moles of solute present in 1 L of solution.

$\boxed{\mathbf{Molarity}\mathbf{ }\mathbf{=}\mathbf{ }\frac{\mathbf{moles}\mathbf{ }\mathbf{of}\mathbf{ }\mathbf{solute}}{\mathbf{volume}\mathbf{ }\mathbf{of}\mathbf{ }\mathbf{solution}\mathbf{ }\left(\mathbf{L}\right)}}$

To find out how many mL of 0.155 M KCl solution contain 2.55 g KCl, we will need the molar mass of KCl first.