15 g of salt was dissolved in 185 g of water. Calculate the mass fraction of a solute in the solution%.

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%;