105 g of potassium phosphate was dissolved in 500 g of water. Calculate the mass fraction

105 g of potassium phosphate was dissolved in 500 g of water. Calculate the mass fraction (%) of the salt in the resulting solution.

To calculate the mass fraction (w) of the salt in the resulting solution, you need to use the formula: w = (m-soluble substance: m-solution) * 100%.
m of a soluble substance – given in the condition (105 g);
m solution = m soluble substance + m solvent;
m of solvent – given in condition (500 g).
m solution = 105 + 500 = 605 (g).
Having everything we need, we can calculate the mass fraction: w = (105: 605) * 100% = 17.4%.
Answer: the mass fraction of salt in the resulting solution is 17.4%.