Problem: Describe how you would prepare each of the following aqueous solutions, starting with solid KBr.0.80 L of 1.6×10−2 M KBr

We’re being asked to determine the amount of KBr needed to prepare 0.80 L of 1.6x10^-2 M KBr.

Recall that molarity is the ratio of the moles of solute and the volume of solution (in liters). 

In other words:

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