A combustion chamber is used to burn a fuel mixture consisting of methane and ethane. The fuel enters the chamber at a temperature of 25C and a pressure of 1atm. Dry air enters the chamber at a temperature of 200C and a pressure of 1atm. 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 800C and a pressure of 1 atm. Analysis of the flue gas has the following composition in mole percent: 1.05%CO,7.52%CO2,13.70%H2O,4.57%O2 and the balance N2 What is the mole percent of ethane in the fuel mixture? % What is the percentage by which dry air is fed in excess? %