What is the mass of the solute if its mass fraction in the solution is 20%? the mass of the solution is 150 g?

To find the mass of a solute, it is necessary to multiply the mass of the solution by its mass fraction.

M substance = M solution x C substance = 150 x 0.2 = 30 grams;

Similarly, we find the mass of water in the solution:

M water = M solution x C water = 150 x 0.8 = 120 grams;

Examination:

M solution = M water + M substance = 120 + 30 = 150 grams;