Determine the mass of salt that must be dissolved in 180 g of water to obtain a solution with

Determine the mass of salt that must be dissolved in 180 g of water to obtain a solution with a mass fraction of this salt of 10%.

In this solution, 180 grams of water will have a mass fraction of 90%.

Find the mass of the solution by dividing the mass of water by its mass fraction.

m solution = 180 / 0.9 = 200 grams;

Let us find the mass of salt by subtracting the mass of water from the mass of the solution.

m salt = 200 – 180 = 20 grams;

Check: 20 + 180 = 200;