Determine the volume/volume percent solution made by combining 25 ml of ethanol with enough water to produce 200 ml of the solution.

Given: Volume of solute = 25ml

             Volume of solution = 200ml 

Solution:

Volume by volume percentage of a solution $= \frac{\mathrm{Volume} \mathrm{of} \mathrm{solute}}{\mathrm{Volume} \mathrm{of} \mathrm{solution}}\times 100$

                                                                                     $= \frac{25}{200}\times 100$

                                                                                     $=\frac{25}{2}$

                                                                                    $=12.5\%$

The volume by volume percentage of the given solution is 12.5%