Question 4. An irreversible gas-phase reaction is conducted in an isothermal batch reactor operated at 400K. The overall reaction may be represented by: AP+2Sr=0.75C2molhrm3 The reactor is initially filled with pure A and the initial pressure is 100kPa. Assume ideal gases. (a) Calculate the time required to achieve an 80% conversion of A if the reactor is a constant volume batch reactor. (b) Calculate the time required to achieve an 80% conversion of A if the reactor is a variable volume, constant pressure batch reactor