2.7 A solution is obtained by mixing of solution and of solution by mass. Calculate the mass percentage of the resulting solution.
According to question we have 2 solute,
Solute 1. : of 300 g gives :
Solute 2. : of 400 g gives :
So total amount of solute = 75 + 160 = 235 g.
Thus mass percentage of solute is :
and mass percentage of water