By 25 g of water, 5 g of salt was added. Determine the mass fraction of the solute in the resulting solution.

Find the mass of the resulting solution:

To do this, we sum up the masses of dissolved salt and water.

M solution = M salt + M water = 25 + 5 = 30 grams;

The mass fraction of the solute in the resulting solution will be equal to the ratio of the mass of this substance to the mass of the resulting solution.

With salt = M salt / M solution = 5/30 = 0.167 = 16.7%;