question_answer

Two liquids A and B have vapour pressures in the ratio of \[{{P}_{A}}{}^\circ :{{P}_{B}}{}^\circ =1:2\] at a certain temperature. Suppose we have an ideal solution of A and B in the mole fraction ratio \[A:B=1:2\]. The mole fraction of A in the vapour phase in equilibrium with the solution at a given temperature is __________.

Answer:

0.2