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Consider a batch distillation process for an equimolar mixture of benzene and toluene at atmospheric pressure. The mole fraction of benzene in the distillate collected after 10 minutes is 0.6. The process in further continued for additional 10 minutes. The mole fraction of benzene in the total distillate collected after 20 minutes of operation is
Options
- A.Less than 0.6
- B.Exactly equal to 0.7
- C.Greater than 0.7
- D.Exactly equal to 0.6
Answer
ASolution
As Distillation progresses, more volatile vaporizes but less volatile also comes into action and vaporizes, making the mole fraction of more volatile in the vapor low. That’s why if Distillation progresses for additional 10 minutes then more volatile fraction decreases in the top product.
Hence, the correct option is (A).
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