Mixed 250 g of 10% and 750 g of 15% glucose solutions. Calculate the mass fraction of glucose in the resulting solution.

The weight of the resulting solution will be equal to the sum of the masses of the two initial solutions.

M = 250 + 750 = 1000 grams;

The mass of glucose in the first solution is 250 x 0.1 = 25 grams;

The mass of glucose in the second solution is 750 x 0.15 = 112.5 grams;

The mass of glucose in the resulting solution will be equal to 25 + 112.5 = 137.5 grams;

The concentration of glucose in the new solution will be 137.5 / 1000 = 0.1375 = 13.75%;