Phosphorus trichloride gas and chlorine gas react to form phosphorus pentachloride according to the following equilibrium: pcl3(g)+cl2(g)⇌pcl5(g) a 7.5-l gas vessel is charged with a mixture of pcl3(g) and cl2(g), which is allowed to equilibrate at 450 k. at equilibrium, the partial pressures of the three gases are ppcl3 = 0.121 atm , pcl2 = 0.157 atm , and ppcl5 = 1.90 atm .

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> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.