Natural gas containing CH4 = 83% and C2H6 = 17% was burnt with an excess of dry air. The Orsat analysis of the flue gas was CO2 = 6.76% ; CO = 2.77% ; O2 = 5.63% ; N2 = 84.84%. Calculate the following:  a. % excess air supplied  b. completion of oxidation of carbon  c. moles of flue gas produced per 100 m3 of fuel at 500oC and 1 atmosphere pressure.

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