Chemistry - Chemical Equilibrium Question with Solution | TestHub

$$\begin{array}{c}\text{When}{\text{N}}_{\text{2}}{\text{O}}_{\text{5}}\text{(g)}\text{is}\text{heated}\text{to}\text{600}\text{K,}\text{it}\text{dissociates}\text{as:}{\text{N}}_{\text{2}}{\text{O}}_{\text{5}}\text{(g)}\rightleftharpoons {\text{N}}_{\text{2}}{\text{O}}_{\text{3}}\text{(g)}\text{+}{\text{O}}_{\text{2}}\text{(g);}\\ {\text{K}}_{\text{C}}\text{=}\text{2.5}\text{M.}\text{Simultaneously,}{\text{N}}_{\text{2}}{\text{O}}_{\text{3}}\text{decomposes}\text{as:}{\text{N}}_{\text{2}}{\text{O}}_{\text{3}}\text{(g)}\rightleftharpoons {\text{N}}_{\text{2}}\text{O(g)}\text{+}{\text{O}}_{\text{2}}\text{(g).}\text{When}\\ \text{initially}\text{4.0}\text{moles}\text{of}{\text{N}}_{\text{2}}{\text{O}}_{\text{5}}\text{(g)}\text{is}\text{taken}\text{in}\text{a}\text{2.0}\text{l}\text{flask}\text{and}\text{allowed}\text{to}\text{attain}\\ \text{equilibrium,}\text{the}\text{equilibrium}\text{concentration}\text{of}{\text{O}}_{\text{2}}\text{(g)}\text{is}\text{found}\text{to}\text{be}\text{2.5}\text{M.}\text{The}\\ \text{equilibrium}\text{concentration}\text{of}{\text{N}}_{\text{2}}\text{O(g)}\text{(in}\text{M)}\text{is}\end{array}$$