A feed gas consisting of CH4 and CO2 is burned with excess air to produce a product gas with the following Orsat analysis: 83.85% N2 10.78% CO2 3.61% O2 1.76% CO Determine the % excess air and the composition of the feed gas (%CH4, %CO2), which does not include the N2 and O2 in the air. The following stoichiometric equations apply: CH4 + 2O2 → CO2 + 2H20   CH4 + 3/2 O2 → CO + 2H2O

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