200 g of potassium chloride was dissolved in 400 g of water. Determine the mass fraction of salt in the solution.

The solution consists of two components: 400 grams of water and 200 grams of salt.

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

m solution = 400 + 200 = 600 grams.

To find the mass fraction of salt, divide the mass of salt by the mass of the solution:

C = m salt / m solution = 200/600 = 0.3333 = 33.33%;