Chemistry - Chemical Equilibrium Question with Solution | TestHub

$\begin{array}{cccc}& {\text{N}}_{\text{2}}{\text{O}}_{\text{4}}\text{(g)}& \rightleftharpoons & {\text{2NO}}_{\text{2}}\text{(g)}\\ \text{Initial}\text{mole}& 1& & 0\\ \text{At}\text{equi}\text{.}& \text{(1-0}\text{.20)}\text{mole}& & \text{0}\text{.40}\text{mole}\end{array}$
${\text{n}}_{\text{total}}\text{=}\text{1}\text{.2}$
${\text{P}}_{\text{total}}\text{=}\frac{{\text{n}}_{\text{total}}\text{RT}}{\text{V}}\text{=}\text{2}\text{.4}\text{atm}$
as$\frac{{\text{P}}_{\text{2}}}{{\text{P}}_{\text{1}}}\text{=}\frac{{\text{n}}_{\text{2}}{\text{T}}_{\text{2}}}{{\text{n}}_{\text{1}}{\text{T}}_{\text{1}}}$