The solution consists of two components: water weighing 185 grams and salt weighing 15 grams.
The mass of the solution is equal to the sum of their masses:
m solution = 185 + 15 = 200 grams.
To find the mass fraction of salt, we divide the mass of salt by the mass of the solution:
C = m salt / m solution = 15/200 = 0.075 = 7.5%;
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