A closed combustion chamber is designed so that it maintains a constant pressure (p) of 120 kPa during the combustion process. The combustion chamber has an initial volume of 0.6 m3 and contains a stoichiometric mixture of octane (C8H18) gas and air at 25oC. The mixture is now ignited, and the product gases are observed to be at 900 K at the end of the combustion process. Assuming complete combustion, and treating both the reactants and the products as ideal gases, determine the heat transfer (Q) from the combustion chamber during this process.