Liquid octane (c8h18) at 770f, 1 atm enters a combustion chamber operating at steady state and burns completely with 50% excess dry air entering at 120°f, 1 atm. the products exit at 1000°f, 1 atm. determine the magnitude (report as positive number) of the rate of heat transfer between the combustion chamber and its surroundings, in btu per lbmol of fuel entering. kinetic and potential energy effects are negligible.