An empty 3.60L steel vessel is filled with 1.25atm of CH4(g) and 5.00atm of O2(g) at 300 ? C. A spark causes the CH4 to burn compl etely, according to the equation: CH4(g)+2 O2(g)?CO2(g)+2H2O(g) ?H? = -802 kJ What is the final temperature inside the vessel after combustion, assuming that the steel vessel has a mass of 13.695kg , the mixture of gases has an average molar heat capacity of 21J/(mol??C), and the heat capacity of steel is 0.499J/(g??C)?