Calculate the percentage composition in terms of mass of a solution obtained by mixing 300 g of a 25% and 400 g of a 40% solution by mass.

Options

A. 0.4357
B. 0.2357
C. 0.3357
D. 0.6357

Answer

C

Explanation

25% solution means 25 g solute in 100 g solution.
40% solution means 40 g solute in 100 g solution.
Mass of solute in 300 g solution = `(25 xx 300)/100 = 75 g`
Mass of solute in 400 g solution = `(40 xx 400)/100 = 160 g`
Total mass of solute = 75 + 160 = 235 g
Mass % in mixture = `235/700 xx 100 = 33.57%`