$($a$)$ Consider the chlorination of methane, given below:

$1C{H}_4(g)+4C{l}_2(g)1CC{l}_4(g)+4HCl(g)$

If $C{H}_4(g)$ is decreasing at the rate of $0\mathrm{.}170mo\frac{l}{s},$ what are the rates of change of $C{l}_2(g),CC{l}_4(g),$ and $HCl(g)?$

$C{l}_2\frac{g}{}t=,mo\frac{l}{s}$

$CC{l}_4\frac{g}{}t=,mo\frac{l}{s}$

$HCl\frac{g}{}t=,mo\frac{l}{s}$

$($b$)$ The decomposition reaction given below:

$2N{H}_3(g)1N_2(g)+3H_2(g)$

Is carried out in a closed reaction vessel. If the partial pressure of $N{H}_3(g)$ is decreasing at the rate of $827$ torr$/$min$,$ what is the rate of change of the total pressure in the vessel?

$\frac{P_{\text{t}\text{o}\text{t}}}{}t=,$tor$\frac{r}{m}in$