ii. Show that the overall Gas Mass transfer coefficient Ke is related to the gas and liquid film coefficients ( k8 and kL respectively) by the equation below: 1/Kg=1/kg+H/kL where H is the Henry's constant. iii. It is desired to absorb 90% of the acetone in a gas containing 1.0 mol\% acetone in air in a counter-current stage absorption tower. The total inlet gas flow to the tower is 30kgmol/h and the total inlet pure water flow to be used to absorb the acetone is 90kgmol/h. The process is to operate isothermally at 300K and a total pressure of 101.3kPa. The equilibrium relation for the acetone (A) in the gas-liquid is yA =2.53A. Determine the number of theoretical stages required for this separation and the minimum solvent rate required. iv. Gas, from a petroleum refinery has its concentration of H2S reduced from 3.2 mole percent to 10% of this value by scrubbing with a solvent in a counter current packed tower. The tower operates at 3000F and 2.0 atmospheres. The equilibrium relationship for the system is Ye=2X, where X,Y are the mole ratios of H2S in the liquid solvent and the refinery gas, respectively. The solvent enters the tower free of H2S at 160mol/hr. If the flow of gas from the refinery is 36mol/hr, determine the height of the absorber in metres Given Tower diameter =4.5m KgaAKgPY1,2(YYe)m=overallcoefficientforabsorption=0.222mol/hr.m3.atm=Towercrosssectionalarea,m2-Overallgascoefficient,0.5molm3hr1atm-pressure,atm-moleratioofammoniaintheinletandoutletgasrespectively-Logarithmicmeangasconcentrationdifference(YYe)m=ln(Y1Ye1)/(Y2Ye2(Y1Ye1)(Y2Ye2)