Methane and oxygen react in the presence of a catalyst to form formaldehyde. In a parallel reaction, methane is oxidized to produce carbon dioxide and water. See these two reactions below. CH4 + O2 HCHO + H2O (desired) CH4 + 2 O2 CO2 + 2 H2O (undesired) 100 mol/s of methane and 100 mol/s of oxygen are fed to a reactor. The fractional conversion of methane is 0.9 and the flowrate of carbon dioxide leaving the reactor is 5 mol/s.

a) Draw a flowchart for this system

b) Conduct a DOF around the system

c) Calculate:

the rates of the two reactions (mol/s)

the selectivity of formaldehyde production relative to CO2 production.

Show full systematic workings.