Chemistry Questions please help!!!?

Hello please show working, I am so stuck! 9) A solute has Kp = 3 between toluene and water. 50 mL of 0.25 M aqueous solution of the solute is extracted with toluene. What is concentration of solute remaining in aqueous layer after 2 x 20 mL extractions ? a. 9.54x10^-3 M b. 6.25x10^-2 M c. 1.5x10^-2 M d.... show more Hello please show working, I am so stuck!

9) A solute has Kp = 3 between toluene and water. 50 mL of 0.25 M aqueous solution of the solute is extracted with toluene. What is concentration of solute remaining in aqueous layer after 2 x 20 mL extractions ?

a. 9.54x10^-3 M
b. 6.25x10^-2 M
c. 1.5x10^-2 M
d. 5.17x10^-3 M
e. 5.17x10^-2 M

10) What is the minimum number of extractions required to ensure 99.9 percent of the solute extracted from a 30 mL sample of 0.1 M aqueous solution of solute is 10 mL portions of chloroform is used. Solute Kp between water and chloroform = 15

a. 2
b. 4
c. 10
d. 25
e. 5
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