3) Two microorganisms are grown in a batch reactor. Both organisms require O2 to grow (obligate aerobes). The bioreactor is initially saturated with O2 before being inoculated with the microbes (saturated O2 concentration So=36mgL1 ). No additional O2 is added to the reactor. Write the mass balance for O2, define all equation terms not listed above. If necessary, provide the boundary condition(s) to solve. Set up equation(s) but do not solve