To 40 g of sodium phosphate with a mass fraction of 8% was added 20 g of a solution with a mass fraction of Na3PO4

To 40 g of sodium phosphate with a mass fraction of 8% was added 20 g of a solution with a mass fraction of Na3PO4 of 5%. What is the mass fraction of Na3PO4 in the resulting solution?

Na3PO4- sodium phosphate.
Progress in solving the problem:
1. Finding the mass of the solute in an 8% solution.
2. Finding the mass of the solute in a 5% solution.
3. Finding the mass of the solute after merging the two solutions.
4. Finding the mass of the solution after draining.
5. Finding the mass fraction of the substance in the resulting solution.
Decision:
1.8 * 40/100 = 3.2g.
2.5 * 20/100 = 1g.
3.3.2 + 1 = 4.2g (add the masses of solutes).
4.40 + 20 = 60g (add up the masses of solutions).
5.W = (mr.v – wa / mr – pa) * 100% = 4.2 / 60 * 100% = 7%