Phosphorus pentachloride decomposes according to the chemical equationPCI, $($g$)=$ PCL$($g$)+$ Cl$,($g$)$Kc $=1\mathrm{.}80$ at $250\backslash$deg CA $0\mathrm{.}2237$ mol sample of PCI, $($g$)$ is injected into an empty $2\mathrm{.}40$ L reaction vessel held at $250\backslash$deg C$.$Calculate the concentrations of PCI, $($g$)$ and PCIg$)$ at equilibrium.