Mining. Mining. In some processes, e.g., underground mines, coal combustion occurs in several reaction in the
gas phase:
CO + 1/2 O2 = CO2
H2 + 1/2 O2 = H2O
CH4 + 3/2 O2 = CO + 2H2O
where the CO, H2, and CH4 come from coal pyrolysis. If a gas phase composed of 13.54% CO,
15.22% CO2 , 15.01% H2, and 3.2% CH4, and the balance N2 is burned with 40% excess, (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? All percentages are mole percents.

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