The percentage decrease is used because the difference in mass does not deal with the proportional aspect of the solutions whereas the percent is calculated to give an exact difference, including the quantities of solution.
Percentage decrease in mass simply means the percentage by which the mass of a substance was decreased in chemistry.
Now, the difference in mass is sometimes useful but then it does not deal with the proportional aspect of the solutions, which makes the results less accurate.
The percentage decrease in mass is usually calculated to give an exact difference while inspecting the quantities of solution.
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