how do i solve this ?

1. The elementary reversible reaction 2AB is carried out in a flow reactor. The feed contains pure A at a concentration of 40mol/m3. The equilibrium conversion is 60%. A) What is the equilibrium constant if the reaction is a gas phase? B) What is the equilibrium constant if the reaction is a liquid phase? C) Write rA as a function of A conversion only. Assume the reaction isothermal in the gas-phase, with no pressure drop. Use kA= 2mol.andm6KC=0.5. D) Repeat C) for a constant volume batch reactor