Chemistry - Chemical Equilibrium Question with Solution | TestHub

$$\begin{array}{c}\text{A}\text{vessel}\text{of}\text{2.5}\text{L}\text{was}\text{filled}\text{with}\text{0.01}\text{mole}\text{of}{\text{Sb}}_{\text{2}}{\text{S}}_{\text{3}}\text{and}\text{0.01}\text{mole}\text{of}{\text{H}}_{\text{2}}\text{to}\\ \text{attain}\text{equilibrium}\text{at}\text{440}{}^{\circ }\text{C}\text{as:}\\ {\text{Sb}}_{\text{2}}{\text{S}}_{\text{3}}\text{(s)}\text{+}{\text{3H}}_{\text{2}}\text{(g)}\rightleftharpoons \text{2Sb(s)}\text{+}{\text{3H}}_{\text{2}}\text{S(g)}\\ \text{After}\text{equilibrium,}\text{the}{\text{H}}_{\text{2}}\text{S}\text{formed}\text{was}\text{analysed}\text{by}\text{dissolving}\text{it}\text{in}\text{water}\text{and}\\ \text{treating}\text{with}\text{excess}\text{of}{\text{Pb}}^{\text{2+}}\text{to}\text{give}\text{1.19}\text{g}\text{of}\text{PbS}\text{as}\text{precipitate.}\text{The}\text{value}\text{of}\\ {\text{K}}_{\text{c}}\text{of}\text{the}\text{reaction}\text{at}\text{440}{}^{\circ }\text{C}\text{is}\text{(Pb}\text{=}\text{206)}\end{array}$$