Three thousand cubic meters per day of a gas mixture containing methane and butane at 21 o C enters an absorption tower. The partial pressures at these entrance conditions are 103 kPa for methane and...

Three thousand cubic meters per day of a gas mixture containing methane and butane at 21^oC enters an absorption tower.  The partial pressures at these entrance conditions are 103 kPa for methane and 586 kPa for butane.  In the tower, 80 % of the butane is removed (absorbed) by some absorbing liquid and the remaining gas leaves the tower at 38^oC and a total pressure of 550 kPa.  Assuming ideal behavior of the entering and exiting gases,

a)  what is the volumetric flow rate of the gas leaving the tower in m³ /day ?

b) How many moles per day of butane are removed from the gas in this tower ?