Three gram-moles of benzene and 7 gram moles of toluene are placed in a closed c
ID: 507961 • Letter: T
Question
Three gram-moles of benzene and 7 gram moles of toluene are placed in a closed cylinder equipped with a piston. The cylinder is immersed in a bath of boiling water that maintains the temperature at 1000C. The force exerted on the piston be to adjust the cylinder pressure to any desired value. The pressure is initially 1000mm Hg and is gradually lowered to 600 mm Hg. Use the Pay diagram of Figure 6.4-1 to convince yourself that the cylinder initially contains only liquid benzene and toluene and to answer the following questions. (a) At what pressure does the first vapor bubble form? What is its composition? (b) At what pressure does the last droplet of liquid evaporate? What is its composition? (c) hat are the liquid and vapor compositions in equilibrium with each other when the pressure is 750 mm Hg? What is the ratio (moles vapor/mole liquid) at this point? mm Hg, and (iii) 600 mm Hg.Explanation / Answer
a) 800 mm Hg, 0.5 ( from the graph, evything can be evaluated).
b) .48, 920 mm Hg.
c) .25, .4, (8/5)
d) 4.56