stream.

Butane $(C_4{H}_{10})$ is fed to a fired heater at a molar flow rate of $100mo\frac{l}{h}$ and $50\%$ excess air. Fifty percent of the butane is consumed, and the product gas contains $9$ mol $C{O}_2$ per mol $CO.$ Calculate the molar flow rate of water in the stack gas.

Butane is completely burned in a process fed with $25\mathrm{.}0\%$ excess air. Based on $1mo\frac{l}{h}$ of butane, determine the composition in mole fractions of oxygen in product stream.