It is proposed to recover acetone, which is used as a solvent in an extraction process, by evaporation into a stream of nitrogen. The nitrogen enters the evaporator at a temperature of 30C containing Acetone such that its dew point is 10 C. It leaves at a temperature of 25 C with a dew point of 20 C. The barometric pressure is constant at 750 mm Hg. (1) Calculate the vapor concentrations of the gases entering and leaving the evaporator in moles of vapor/ moles of vapor free-gas. (ii) Calculate the moles of acetone evaporated per mole of vapor free gas passing through the evaporator. mole of vapor free gas. (iii) Calculate the weight of acetone evaporated per 100 m of gases entering the reactor. (iv) Calculate the volume of gases leaving the evaporator per 100 m entering. (12) (April '98)