The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vaporised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is_________________?
Correct answer: B. 0.6
- A. 0.4
- B. 0.6
- C. 0.8
- D. 0.2
Explanation
For an ideal liquid mixture, the vapor contribution is proportional to x_iP_i^sat. Thus benzene contributes 0.4(3)=1.2 and toluene 0.6(4/3)=0.8, giving y_benzene=1.2/(1.2+0.8)=0.6.
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