A #225*g# mass of glucose is dissolved in a #5*L# volume of water. What is the concentration of the solution? Do we have to account for volume change upon dissolution of the solute?
We must assume that the volume is constant. And I doubt even the dissolution of such a quantity of glucose would cause significant volume change.
Note that the way we do the problem, by including the dimensions, is a good check on our calulations. It is all to easy to divide instead of multiply, and vice versa.
Mass of Solute
Volume of Solution