A gaseous fuel with 80 percent CH4, 15 percent N2, and 5 percent O2 (on a mole basis) is burned with dry air that enters the combustion chamber at 25°C and 100 kPa. The volumetric analysis of the products on a dry basis is 3.36 percent CO2, 0.09 percent CO, 14.91 percent O2, and 81.64 percent N2. Determine (a) the air€“fuel ratio, (b) the percent theoretical air used, and (c) the volume flow rate of air used to burn fuel at a rate of 1.4 kg/min.

80% CH4 3.36% CO, 0.09% CO 14.91%02 81 ,64% N, 5% 02 Combustion chamber AIR-