A flexible vessel maintains constant pressure of 300kPA during acombustion process. The vessel has an initial volume of 0.8 m3 and contains astoichiometric mixture of octane (C8H18) gas and air at 25°C. The mixture isignited and the product gasses are observed to be at 1000K and the end of thecombustion process. Assume complete combustion occurs and that the reactants and the products are ideal gases. Determine the heat transfer from the vessel during the process.