The combustion of benzene is represented by the chemical reaction 2(C₆H₆) + 15(O₂) → 12(CO₂) + 6(H₂O). The amount of energy released in the combustion of two mol of benzene is 1516 kcal. One mol of benzene and 7.5 mol of oxygen at 300 K are confined in an insulated enclosure at a pressure of 1 atm.

(a) Find the temperature and volume following combustion if the pressure is maintained at 1 atm.

(b) If, following combustion, the thermal insulation about the container is removed and the system is cooled to 300 K, what is the final pressure?