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A packed bed reactor is filled with catalyst material with a diameter of 1.5 mm. The length of the reactor is 80 cm and the catalyst has a porosity of 0.45. The superficial mass velocity of the inlet gas is 7.5 kg/m2-s with a viscosity of 1.55x10-5 kg/m-s and a density of 2.8 kg/m3. The inlet pressure is 300 kPa. Find the pressure, P, at the end (the exit) of the PBR.