Ethane is burned with $50\%$ excess air. The percentage conversion of the ethane is $90\%$; of the ethane burned, $25\%$ reacts to form CO and the balance reacts to form $C{O}_2.$ Calculate the molar composition of the stack gas on a dry basis and the mole ratio of water to dry stack gas.

You are requested as a process engineer to perform the analysis on both dry and wet basis of the product stream generated from the combustion unit of your plant. Butane $(C_4{H}_{10})$ is burnt in the combustion chamber at a rate of $250$ mole$/$hr with $150\%$ excess air. $80$mol$\%$ of the feed goes to complete combustion while $15$mol $\%$ goes to incomplete combustion and the balance remains unburnt.