Aliquid mixture of benzene and toluene containing 50.0 wt% benzene at 100.0 °c and pressure p0 atm is fed at a rate of 32.5 m3/h into a heated flash tank maintained at a pressure ptank < < p0. when the feed is exposed to the reduced pressure in this unit, a portion of it evaporates. the liquid and vapor product streams are in equilibrium at 75.0 °c and ptank. the liquid product contains 43.9 mole% benzene. when carrying out the requested calculations, assume volume additivity of liquid benzene and toluene, use raoult's law and the antoine equation where necessary, and negelect the effect of pressure on enthalpy.