Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is_________________?
Correct answer: D. xB.PvB
- A. PvB
- B. xB.Patm
- C. (Patm - Pvw)xB
- D. xB.PvB
Explanation
For an ideal liquid solution, Raoult’s law gives the benzene partial pressure as the liquid mole fraction multiplied by benzene’s pure-component vapour pressure, pB = xB PvB. The presence of air does not change this equilibrium relation.
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