(Solution) - A gaseous fuel with 80 percent CH4 15 percent -(2025 Original AI-Free Solution)

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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.