In 500 g of water, 20 g of salt was dissolved. Determine the mass fraction of salt in the resulting solution.

The solution consists of two components: water weighing 500 grams and salt weighing 20 grams.

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

m solution = 500 + 20 = 520 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 = 20/520 = 0.0385 = 3.85%;