So yeah, I have an exercise that goes as follows: "0,3 moles of CH4 are burnt in 2,4 moles of air. Knowing that the final gaseous mix is only composed of N2, CO2, CO and water vapor, and by admittinng that the composition of air is 80% of N2 and 20% of O2, what if the final molar fraction of CO2?"
So essentially, I'm supposed to figure out how much CH4 is going to react with O2 to make CO2, and how much is going to make CO. The only problem is, I have no idea how to do that. The only thing I know is that CH4 will react with O2 to make CO if there's not enough O2, but when I think about it carefull, that doesn't actually make sense. If CH4 favors reacting with O2 to make CO2, why does it not simply do it until there's no more O2, and therefore no more reaction possible? Why does it decide to stop producing CO2 and start producing CO? Is it capable of foresight, does it know that it won't be able to be completely combusted if it keeps making CO2?
So yeah, anyone mind explaining?