Answer:
Step-by-step explanation:
The mass of polymer in the order recieved is:
- 3000 lb * 13/100 = 390 lb
The mass of polymer in the 10% solution is:
So to solve this problem, we need to add (390-50) 340 lb of polymer that comes from the 20% solution.
We calculate the mass of the 20% solution that would contain 340 lb of polymer:
- 340 lb * 100/20 = 1700 lb
So far, in total we have a solution that weighs (1700+500) 2200 lb and contains 390 lb of polymer.
Thus, in order to reach the required mass of solution (and percentage of polymer by weight), we add (3000-2200) 800 lb of pure solvent.