Liquid octane (C3H18) at 77F, 1 atm enters a combustion chamber operating at steady state and burns completely with 50% excess dry air entering at 120F, 1 atm. The products exit at 1800F, 1 atm. Determine the magnitude of the rate of heat transfer between the combustion chamber and its surroundings, in Btu per Ibmol of fuel entering. Kinetic and potential energy effects are negligible. Qey i Btu/Ibmol(C3H18) Nfuel