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

Sure, let's solve this step by step:

1. First, we need to find out how much of the solute is in each solution.

2. For the 300 g of 25% solution: The amount of solute = 25/100 * 300 g = 75 g

3. For the 400 g of 40% solution: The amount of solute = 40/100 * 400 g = 160 g

4. Now, add the amounts of solute together to get the total amount of solute in the final solution: Total amount of solute = 75 g + 160 g = 235 g

5. The total mass of the solution is the sum of the masses of the two solutions you mixed together: Total mass of solution = 300 g + 400 g = 700 g

6. Finally, to find the mass percentage of the solute in the final solution, divide the total amount of solute by the total mass of the solution and multiply by 100%: Mass percentage = (235 g / 700 g) * 100% = 33.57%

So, the mass percentage of the resulting solution is approximately 33.57%.