What mass of water and FeSO4 should be taken to prepare 460 g of a solution with a mass fraction of 12%?

The mass of the solution is 460 grams;

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

m of salt = 460 x 0.12 = 55.2 grams;

To find the mass of water, subtract the mass of salt from the mass of the solution:

m of water = 460 – 55.12 = 404.88 grams;

Check: 404.88 + 55.12 = 460;