Molarity = moles of solute/volume (in liters) of solution.
We have 14.1 moles of FeCl3, which is the solute, and the volume of our solution is 2.350 liters. So, the molarity of the solution would be (14.1 moles FeCl3)/(2.350 L solution) = 6 moles/L FeCl3 or 6 M FeCl3.
