Determine the actual molar and mass airfuel ratios- the

Question

The combustion of an unknown amount of methane (x moles of CH₄) in a furnace results in the following dry exhaust gas molar analysis: 9.52% CO₂, 4.00% O₂, and 86.47% N₂. Determine

a. The actual molar and mass air/fuel ratios.

b. The percent of excess air used.

c. The molar percentage of water vapor in the exhaust gas before it was dried for this analysis.