Two volatile liquids a and b form an ideal mixture at, Ask an Expert

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Two volatile liquids (A and B) form an ideal mixture at 300.0K which just begins to boil at a pressure of 0.3000 atm. The vapor pressure of pure component A is 0.5000 atm and the vapor pressure of pure component B is 0.2000 atm, both at 300.0K. The closest value to the mole fraction of component A in the mixture is:

A. 0.40

B. 0.20

C. 0.33

D. 0.66

E. 0.80

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