The vapour pressures of A and B at 25°C are 90 mmHg and 15 mm Hg respectively. If A and B are mixed such that the mole fraction of A in the mixture is 0.6, then the mole fraction of B in the vapour ph

Question

The vapour pressures of A and B at 25°C are 90 mmHg and 15 mm Hg respectively. If A and B are mixed such that the mole fraction of A in the mixture is 0.6, then the mole fraction of B in the vapour phase is . The value of x is (Nearest integer)

Canvas Classes · Accepted Answer

Strategy:
 Calculate total pressure using Raoult's law, then determine the vapour phase mole fraction of B using the ratio of its partial pressure to the total pressure.

Step 1: Identify liquid phase mole fractions
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Step 2: Calculate partial pressures
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Step 3: Calculate total pressure

Step 4: Find the mole fraction of B in the vapour ()

Step 5: Convert to 
.

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