To 500 g of a glucose solution with a mass fraction of 40%, 100 g of water was added.

To 500 g of a glucose solution with a mass fraction of 40%, 100 g of water was added. What was the mass fraction of glucose?

Glucose formula: C6H12O6.
1) The mass of the solute glucose in its solution is found by multiplying the mass fraction of the substance by the mass of the solution: 500 * 40/100 = 200g.
2) Because water was poured in, not a glucose solution, then only the mass of the solution changes. The mass of the solute does not change.
3) Find the mass of the solution after adding water. To do this, add the mass of the original solution and the mass of added water: 500 + 100 = 600 g.
4) The mass fraction of glucose in the solution after adding water is equal to: 200/600 * 100 = 33.3% – the answer.