please solve it step by step

3. (30 pts) For a complex reaction system taking place in a batch reactor: ARRAS R+S42s Assume all the reactions are elementary, please write down the differential equation associated with each species clearly. Use a differential equation solver (e.g., MATLAB) to solve the problem and plot the concentrations of the species as a function of time (up to 2000 sec). The parameters are: ki - 1.0 x 10-3 s-1; k, = 1.2 x 10-3s-1, kg = 1.6 x 10-3 dmmol-Is-1 CAO = 1 mol dm-3; CRO = Cso = 0