For a separations process it is necessary to determine the vapor-liquid equilibrium compositions of a mixture of "A" and "B" at 30 ?C. At this temperature the vapor pressure of pure "A" is 0.7569 bar, and the vapor pressure of pure "B" is 0.0773 bar. Calculate the bubble pressure and the composition of the vapor in equilibrium with a liquid containing 47% "A" assuming ideal solution behavior (i.e. Raoult's Law). Compare the calculated pressure to the experimental value of 0.45 bar.