P4-4 B The elementary reaction A(g)+B(g)C(g) is taking place only in the gas phase of a square duct. The feed to the duct consists of a gas stream of pure A and a liquid stream of pure B. The flowing liquid B covers the bottom of the duct and evaporates into the gas phase, maintaining its equilibrium vapor pressure throughout the system. The gas phase flows in plug flow. Ignore the volume occupied by liquid B (see Figure P44B) (a) Express the rate law solely as a function of conversion, and evaluate numerically all possible symbols. (b) What is the rate of reaction, rA, when the conversion is 50% ? Additional Information: Total pressure (considered constant): 1atm Value of k:106ft3/lbmol Temperature within the reactor (considered constant): 540F Vapor pressure of B: 0.25atm at 540F Inlet flow rate of A: 1.5lbmol/s