400 ml of solution contains 20 g of solute. Calculate the concentration in terms of mass by volume percentage of the solution.

Given:  Mass of solute = 20g

               Volume of solution = 400 ml

Solution:

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

                                                                               $= \frac{20}{400}\times 100$

                                                                              $=\frac{20}{4}$

                                                                             $=5\%$

  The mass by volume percentage of the given solution is 5%