Jasmone (molecular formula C₁₁H₁₆O) is a valuable specialty chemical that is obtained from the jasmine plant. A common method of manufacture is to extract the plant material in water, and then use benzene to concentrate the jasmone in a simple liquid-liquid extraction process. Jasmone (species A) is 170 times more soluble in benzene than in water, and so 

c′_A = 170 c_A

where c'_A is the concentration of jasmone in benzene, and c_A is the concentration of jasmone in water. In a proposed extraction unit, the benzene phase is well mixed with the film mass- transfer coefficient k'_L = 3.5 × 10^-6 m/s. The aqueous phase is also well mixed with its film mass-transfer coefficient k_L = 2.5 × 10^-5 m/s. Determine 

a. The overall liquid mass-transfer coefficient, K'_L, based on the benzene phase 

b. The overall liquid transfer coefficient, K_L, based on the aqueous phase 

c. The percent resistance to mass-transfer encountered in the aqueous liquid film