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A German fuel blend called Reichkraftskoff is made up of 50% motor benzole (75% benzene, 15% toluene, 10% xylene), 25% tetralin (C10H12) and 25% industrial alcohol (80% ethanol, 20% methanol). After combustion in excess air, a stack gas containing 9.13%CO2 and 1.83%CO is obtained. Calculate a) % excess air; b) Complete Orsat analysis of the stack gas.