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