25 g of the substance was dissolved in 75 g of water. The mass fraction of the substance (%) in the resulting solution is equal to.
The solution consists of two components: water weighing 75 grams and a substance weighing 25 grams.
The mass of the solution is equal to the sum of their masses:
m solution = 75 + 25 = 100 grams.
To find the mass fraction of salt, we divide the mass of the substance by the mass of the solution:
C = m substance / m solution = 25/100 = 0.25 = 25%;
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