$\mathrm{PC}_1 \rightleftharpoons \mathrm{PCl}_3+\mathrm{Cl}_3 \mathrm{~K}_{\mathrm{c}}=1.844$
3.0 moles of $\mathrm{PCl}_5$ is introduced in a 1 L closed reaction vessel at 380 K . The number of moles of $\mathrm{PCl}_5$ at equilibrium is $\_\_\_\_$ $\times 10^{-3}$.
(Round off to the Nearest Integer)