In underground coal combustion in the gas phase several reactions take place, includingwhe...

In underground coal combustion in the gas phase several reactions take place, including

where the CO, H, and CH4 come from coal pyrolysis.

If a gas phase composed of CO 13.54%, CO2 15.22%, H2 15.01%, CH4 3.20%, and the balance N2 is burned with 40% excess air, (a) how much air is needed per 100 moles of gas, and (b) what will be the analysis of the product gas on a wet basis?