Acetylene gas at 77 F is burned with 140% theoretical air, which enters the burner at 77 F, 14.7 lbf/in 2, 80% relative humidity. The combustion products form a mixture of CO2, H2O, N2, O2, and NO in chemical equilibrium at 3500 F, 14.7 lbf/in 2. This mixture is then cooled to 1340 F very rapidly, so that the composition does not change. Determine the mole fraction of NO in the products and the heat transfer for the overall process.