Answer:
Answer a) is 2000 mL solution 1.
Answer b) is 40 mL solution 1 and 60 mL solution 2.
Answer c) isn't possible to produce a solution with 90% benzene and 10% toluene because is a percentage of benzene higher than the solution 1 and solution 2.
Explanation:
You can solve using an equation system base on the benzene percentage/ratio of each solution.
Answer a) X-> mL of solution 1
x*0.8+500*0.3=(500+ x)*0.7
x *0.8+500*0.3=500*0.7+ x*0.7
x*(0.8-0.7)=500*(0.7-0.3)
X*0.1=200
x=2000mL
Answer b) X-> mL of solution 1
x*0.8+(100-x)*0.3=(100)*0.5
x *0.8+100*0.3-x*0.3=50
x*(0.8-0.3)=50-30
x*(0.5)=20
x=40 mL
mL of solution 2=(100-x)=100-40=60 mL