Suppose you have been given the task of distilling a mixture of hexane toluene.

Question

Suppose you have been given the task of distilling a mixture of hexane toluene. Pure hexane has a refractive index of 1.375 and pure toluene has a refactive index of 1.497. You collect a distillate sample which has a refractive index of 1.411. Assuming that the refractive index of the hexane toluene mixture varies linearly with mole fraction, what is the mole fraction of hexane in your sample? Imagine making a graph of refractive index versus mole fraction hexane. You have been given two known points,and can determine the equation (slope and intercept) of the straight line passing through these points. Use this equation to solve the unknown mole fraction hexane Submit Answer Incorrect. Tries 8/10 Previous Tries

Explanation / Answer

First calculate the range for toluene

0% to 100%

= 1.497 - 1.375

= 0.122

Calculate the range for toluene from 0% to somewhat x%

= 1.411 - 1.375

= 0.036

Mol fraction of toluene = 0.036/0.122

= 0.29508

Mol fraction of hexane = 1 - 0.2950

= 0.7050

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