Problem III:

The reaction between ammonia and formaldehyde to produce hexamine is

$4N{H}_3+6$HCHO$(C{H}_2{)}_6{N}_4+6H_{2}O$

A $0\mathrm{.}5$ liter CSTR is used for the liquid$-$phase reaction. Each reactant is fed to the reactor in a separate

stream, at the rate of $1\mathrm{.}5{10}^{-3}$ liter $\frac{?}{s}$ each. The ammonia concentration is $4\mathrm{.}0mo\frac{l}{?}$ liter and the

formaldehyde concentration is $6\mathrm{.}4mo\frac{l}{?}$ liter. The reactor temperature is $36C.$ Calculate the

concentration of ammonia and formaldehyde in the effluent stream. In the kinetics below, $A$ is ammonia

and $B$ is formaldehyde.

$(-r_A)=k{C}_A{C}_B^2$ mole $\frac{A}{?}$ liter$-$s where $k=1,420$exp$(-\frac{3090}{T}),$ where $T$ in $K,$ and $k$ in $s^{-1}$