Agas consisting only of co and n2 is made by passing a mixture of flue gas and air through a bed of incandescent coke (assume pure carbon). the two reactions that occur both go to completion: co2 + c → 2co and 2c + o2 → 2co the flue gas composition is 12.8 mol-% co, 3.7 mol-% co2, 5.4 mol-% o2, and 78.1 mol-% n2. the flue gas/air mixture is so proportioned that the heats of the two reactions cancel, and the temperature of the coke bed is therefore constant. if this temperature is 875°c, if the feed stream is preheated to 875°c, and if the process is adiabatic, what ratio of moles of flue gas to moles of air is required, and what is the composition of the gas produced?