A combustion chamber is used to burn a fuel mixture consisting of methane and ethane. The fuel enters the chamber at a temperature of 25°C and a pressure of 1 atm. Dry air enters the chamber at a temperature of 200°C and a pressure of 1 atm. Excess air is used for combustion. Assume the air to be 21.0 mole% O2 and the balance N2. The flue gas exits at a temperature of 800°C and a pressure of 1 atm. Analysis of the flue gas has the following composition in mole percent: 1.62% CO, 8.52% CO2, 4.21% 02 and the balance N2. Calculate the % of methane in the fuel

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