Another 12 g of the same salt was added to 120 g of a 10% salt solution.

Another 12 g of the same salt was added to 120 g of a 10% salt solution. Find the mass fraction of substances in the resulting solution.

In order to solve this problem, you first need to calculate the mass of the solute of the salt in its solution. To do this, we multiply the mass fraction of the substance by the mass of the solution and divide by one hundred percent. Why do we calculate the mass of the solute and the entire solution after adding salt. Well, and, we find the mass fraction of salt in the resulting solution.
Solution:
1) 120 * 10/100 = 12g.
2) 12 + 12 = 24g.
3) 120 + 12 = 132g.
4) 24/132 * 100 = 18.18% – the answer.