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Liquids A and B form an ideal solution in the entire composition range. At 350 K, the vaapor pressures of pure A and pure B are 7 × 10 3 Pa and 12 × 10 3 Pa, respectively . The composition of the vapor in equilibrium with a solution containing 40 mole percent of A at this temperature is :

1. x A = 0.76; x B = 0.24
2. x A = 0.28; x B = 0.72
3. x A = 0.4; x B = 0.6
4. x A = 0.37; x B = 0.63

Correct answer: x A = 0.28; x B = 0.72

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