Butane $(C_4{H}_{10})$ and dry air are fed to a combustion reactor at a steady rate of $53\mathrm{.}9mo\frac{l}{s}$ butane and $2500\mathrm{.}0mo\frac{l}{s}$ dry air.

Assume the butane reacts completely to produce $C{O}_2$ and $H_{2}O.$ The reactants enter the reactor at $25C$ and the products leave

the reactor at $1033\mathrm{.}4C.$ Calculate the percent excess air.

Using the information below, find the heat interaction.