25 g of salt was dissolved in 200 ml of water. The mass fraction of the substance in the resulting solution is (%)

In this task, it is necessary to determine the mass fraction of the substance in the resulting solution. We write down the resulting solution.

The volume of water is 200 ml.

The mass of salt is 25 g.

Let’s define the mass fraction.

First, you need to determine the mass of water. We use the following formula.

m = pV.

That is, you need to multiply the volume of water by the density.

m (H2O) = 200 * 1 = 200 g.

Next, we determine the mass of the resulting solution.

m solution = 200 + 25 = 225 g.

Next, we determine the mass fraction of salt in the solution.

W = 25/225 * 100% = 11%.

Therefore, the mass fraction of the substance in the resulting solution is 11 percent.

Answer: 11%.