(solution) Hi! I have been struggling with this question for the past 4

(solution) Hi! I have been struggling with this question for the past 4

Hi! I have been struggling with this question for the past 4 hours. I need some help on how to approach it and find the result. Thanks in advance for your help.

Assume you are given a mixture of these two liquids of composition 70 mol % toluene and 30 mole % benzene and that it is necessary to effect a fractional distillation that will afford benzene >99% purity. What would be the minimum number of theoretical plates required?