The following dry exhaust volumetric analysis results from the combustion of an unknown amount of octane (x moles of C8H18) in a spark ignition internal combustion engine: 8.80% CO2, 8.20% CO, 4.1% H2, 1.00% NO, 0.200% CH4, and 77.7% N2. Determine
a. The actual molar and mass air/fuel ratios.
b. The percent of theoretical air used.
c. The molar percentage of water vapor in the exhaust gas before it was dried for this analysis.