Answer:
Explanation:
Refractive index is a undimensional measurement that describes how fast light travels through the material. It is used to see the liquid purity of compounds.
In this problem you have in the beginning a 50:50 solution oh hexane:nonane and realize distillation.
In distillation the collect is enriched with the most volatille substance (hexane). So you will have in the final sample more hexane than nonane.
Assuming the refractive index varies linearly with mole fraction, you will have:
1,375 → 100% hexane
1,407 → 100% nonane
1,385 → ???
molar fraction of hexane:
100 - (1,385 - 1,375) / (1,407 - 1,375) × 100 = 69 %
molar fraction of nonane:
100 - (1,407 - 1,385) / (1,407 - 1,375) × 100 = 31 %
The relation of the distillating fraction is (69:31) of (hexane:nonane)
You can see that distillation is a technique that allows the separation of a liquid mixture, for example.
I hope it helps!
