An adhesive chemical company produces formaldehyde using the catalytic oxidation of methanol. Methanol and air are fed to a fixed bed reactor which operates at atmospheric pressure and a temperature of $625C.$ Due to these temperatures methanol and water are in the vapour phase.

$C{H}_{3}OH+\frac{1}{2}{O}_{2}longrightarrowC{H}_{2}O+H_{2}O(eq1)$

Unfortunately, a side reaction occurs where carbon dioxide is produced.

$C{H}_{2}O+O_{2}longrightarrowC{O}_2+H_{2}O(eq2)$

Methanol has a feed rate of $4$kmo$\frac{l}{?}$ hour and a $75\%$ conversion percentage. $8\mathrm{.}69$kmo$\frac{l}{?}$ hour and $3\mathrm{.}25$kmo$\frac{l}{h}$our of nitrogen and water flow out of the reactor respectively. The product stream then undergoes further processing to make the desired adhesives.

What is the mole percentage of $C{O}_2$ in the product stream?