Effusion is a process in which a gas escapes from a container through a small opening into a vacuum. In a pair of experiments, a sample of tetrafluoroethylene, $C_2{F}_4$ effuses at a rate of $4\mathrm{.}6{10}^{-6}mo\frac{l}{h}$ and an unknown gas effuses at a rate of $8\mathrm{.}7{10}^{-6}mo\frac{l}{h}.$

Identify the unknown gas. $($The molar mass of each gas is given.$)$

$N_{2}28\mathrm{.}01\frac{g}{m}ol$

$C{O}_{2}44\mathrm{.}01\frac{g}{m}ol$

$S{F}_{6}146\mathrm{.}06\frac{g}{m}ol$

Xe $131\mathrm{.}29\frac{g}{m}ol$

$CHC{l}_{3}119\mathrm{.}38\frac{g}{m}ol$