What is the mass fraction (%) of the solute in a solution obtained by dissolving potassium chloride 5 g in water 45?

Let’s find the mass of the solution. To do this, add the masses of water and salt.

M solution = M water + M salt = 5 + 45 = 50 grams;

To find the mass fraction of salt, it is necessary to divide the mass of salt by the mass of the solution.

With salt = M salt / M solution = 5/50 = 0.1 = 10%;

Similarly, you can find the concentration of water:

With water = M water / M solution = 45/50 = 0.9 = 90%;