4) Batch distillation with constant reflux ratio is used to separate a binary mixture. Based on a given reflux ratio (R=2.5) and number of plates, the composition of the distillate stream has already been determined for a range of different compositions of liquid in the still, as shown in the table. a) Initially, the still contains 100 kmols of liquid in which the mole fraction of the more volatile component is 0.13 . How many moles of distillate have been collected when the composition of the distillate stream has fallen to 0.75 ? b) What is the mole fraction of the more volatile component in the collected distillate when the composition of the distillate stream is 0.75? c) Evaluate the energy used to carry out the separation until the distillate stream reaches 0.75 . The enthalpy of vaporisation can be assumed to be 38kJmol1. d) Heat is supplied to the reboiler at a constant rate. Calculate the rate of heat input required for the mole fraction of the distillate stream to fall to 0.75 after exactly one hour