Liquids A and B form an ideal solution in the entire composition range. At 350 K, the vapour pressure of pure A and pure B are Pa and Pa, respectively. The composition of the vapour in equilibrium w

Question

Liquids A and B form an ideal solution in the entire composition range. At 350 K, the vapour pressure of pure A and pure B are  Pa and  Pa, respectively. The composition of the vapour in equilibrium with a solution containing 40 mole percent of A at this temperature is:

Canvas Classes · Accepted Answer

Strategy:
 Use Raoult's law to find partial pressures from liquid composition, then use Dalton's law to find the mole fraction of each component in the resulting vapour.

Step 1: Define liquid phase concentrations
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Step 2: Calculate partial pressures
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Step 3: Calculate total pressure

Step 4: Find vapour phase mole fractions ()
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