15 g of sodium sulfate was dissolved in 100 g of water. Calculate the mass fraction of salt in the resulting substance.

The mass of water is equal to – 100 g.

The mass of sodium sulfate is 15 g.

Determine the mass fraction of sodium sulfate in this solution.

First, let’s write down the formula for solving the problem.

W = m r.v. / m r-ra * 100%.

Let’s determine the mass of the solution.

m solution = mH2O + m r.v.

m solution = 100 + 15 = 115 g.

Next, you should determine the mass fraction of this substance.

W = 15/115 * 100 = 13%.

Therefore, the resulting solution contains 13 percent of the substance.

Answer: This solution contains 13 percent sodium sulfate.