Phase equilibrium 的问题。请帮帮忙

ting_006

The graph below show the concentration of idine in CCl4 against concentration of iodine in the aqueous layer.

(the graph of then concentration of I2(CCl4)  against concentration of I2.)


0.6g of iodine is shaken with a mixture 25.0cm^3  of water and 25.0cm^3 of cyclohexane.At equilibrium , the amount of iodine in 5.0cm^3 of the cyclohexane requires 10.8cm^3 of a 0.01mol dm^-3 sodium thiosulphate for complete reaction.Calculate the partition coefficient of iodine between cyclohexane and water at the temparature of the experiment.


要怎么算？？请各位帮帮忙。