Please go step by step and explain.

The elementary reversible gas-phase reaction A + B C + D is carried out adiabatically in a series of staged CSTRs with inter-stage cooling. The lowest temperature to which the reactant stream may be cooled is 27C. The feed is equimolar in A and B and enters at 27C; the catalyst weight is sufficient in each reactor to achieve 99.9% of the equilibrium conversion. Additional information:

Hrxn = 30, 000 cal/mol A CPA = CPB = CPC = CPD = 25 cal/ (mol K) KC (323 K) = 500, 000 FA0 =10 mol/min

If four reactors and three heat exchangers are available, what conversion can be achieved? Plot the equilibrium conversion versus temperature curve, and the energy balance lines for each reactor. Also, determine the duty of each heat exchanger.