For a flow system, the concentration CA at a given point can be determined from the molar flow rate FA and the volumetric flow rate υ at that point:
Units of υ are typically given in terms of liters per second, cubic decimeters per second, or cubic feet per minute. We now can write the concentrations of A, B, C, and D for the general reaction given by Equation (2-2) in terms of their respective entering molar flow rates (FA0, FB0, FC0, FD0), the conversion X, and the volumetric flow rate, υ.
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