Liquid ethanol (C2H5OH) at 25°C, 1 atm enters an insulated reactor operating at steady state and burns completely with air entering at 370 K, 1 atm. The combustion products exit at 1000 K. Kinetic and potential energy effects can be neglected and the air can be modeled as 21% O2 and 79% N2 on a molar basis. Determine the percent excess air used.

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