200 g of the solution contains 10 g. salt. What is the mass fraction of salt in the solution?

The solution consists of two components: water weighing 200 – 10 = 190 grams and salt weighing 10 grams.

The mass of the solution is equal to the sum of their masses:

m solution = 190 + 10 = 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 = 10/200 = 0.05 = 5%;