Question:
A solution is obtained by mixing 300 g of 25% solution and 400 g of 40% solution by mass. Calculate the mass percentage of the resulting solution.
Answer:
Mass of component in solution 1 = 25% of 300 gram = 25 x 300/100 = 75 gram
Mass of component in solution 2 = 40 % of 400 gram = 40 x400/100 = 160 gram
Total mass of solution (1 and 2) = 300+400 = 700 gram
Total mass of component (1 and 2) = 75+ 160 = 235 grams
Mass % of final solution = mass of component x 100 / total mass =235 x 100/700 = 33.5%
So, water in solution in % = 100 – 33.5 = 66.5 %
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