3) The gas phase irreversible elementary reaction A+B C is carried out in an isothermal plug flow reactor at a temperature of 100C. The rate constant is 0.05 liters/mol-min. The reactor is fed with 100 liters/minute of an equimolar mixture of "A" and "B", each having an inlet concentration of 0.2 mol/liter. Neglect pressure drop in the reactor. Determine: a) The pressure (kPa) of the feed stream (recall Ru=8.314kPa-m/kmol-K). b) The reactor volume needed for a conversion of 80%