how do i solve this ?

The following isothermal, isobaric, catalytic gas-phase oxidation reaction is carried out in a reactor: C2H4(g)+0.5O2(g)CH2OCH2(g) The reactor is operated at 6atm and 260C. The feed is a stoichiometric mixture of ethylene and oxygen. You may assume the reaction is elementary. Set up the stoichiometric table and express rA as a function of partial pressures. Express the partial pressures and rA as a function of conversion for fluidized batch reactor and for a PBR (PFR like). Write rA as a function of the rate constant and conversion only