In 200 g of water, 50 g of salt was dissolved to determine the mass fraction of salt in the prepared solution.

The solution consists of two components: 200 grams of water and 50 grams of salt.

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

m solution = 200 + 50 = 250 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 = 50/250 = 0.2 = 20%;