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At 25°C, liquids A and B create an ideal solution for all proportions of A and B. Two mixtures with mole fractions of A as 0.25 and 0.50 exhibit total vapor pressures of 0.3 bar and 0.4 bar, respectively. Determine the vapor pressure of pure liquid B in bar.
- 0.1
- 0.2
- 0.3
- 0.4
Correct answer: 0.2
Solution
For an ideal solution, the total vapor pressure is the sum of the partial pressures of A and B. Using Raoult's law and the given mole fractions, the equations can be solved to find the vapor pressure of pure B as 0.2 bar.
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