9. A certain natural gas has the following volumetric analysis: 73.4% CH4, 8%C2H6, 5% C3H8, 2%C4H10, 1.8% H2, 8% N2, 0.8% 02 and 1% CO2. This gas is now burned with the 100% excess air that enters the...

Extracted text: 9. A certain natural gas has the following volumetric analysis: 73.4% CH4, 8%C2H6, 5% C3H8, 2%C4H10, 1.8% H2, 8% N2, 0.8% 02 and 1% CO2. This gas is now burned with the 100% excess air that enters the combustion chamber at 18°C, 1 atm, and 75 percent relative humidity. Assuming complete combustion and a total pressure of 1 atm, determine the a. air- fuel ratio b. dew-point temperature of the products