100 mol/hr of butane (C4H10) enter a reactor and is burned with 25% excess pure oxygen, producing CO2, CO, and H2O. The product gases (including C4H10 and O2) enter a separator where 90% of the unreacted C4H10 and O2 are recycled and mixed with a fresh feed of C4H10 and O2 to form the stream (previously described) that was fed to the reactor. The rest of the product gases exit the separator as a waste stream. If the single-pass conversion of butane is 45% and there is nine times as much CO2 as CO in the product gas leaving the reactor. Complete the followingA) the composition of the product gas from the reactor: B) the molar flow rates of the fresh feed; C) the overall process conversion of butane.

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?