Equilibrium constant of the phosphorus pentachloride decomposition to phosphorus trichloride and chlorine PCl5(g)=PCl3(g)+Cl2(g) at a temperature of 500K (the ideal gas for the standard state at the system temperature and pressure pst=101.325kPa ) has a value of 0.834. The decomposition takes place in a closed reactor of constant volume, which was initially filled with pure PCl5 to a pressure of 101.325kPa. Calculate the reactor pressure after equilibration. Assume ideal gas phase behaviour