1.

The performance equation of a CSTR is ____(a) \(\frac{F_{A_0}}{V} = \frac{(-r_A)}{X_A} \)(b) \(\frac{F_{A_0}}{V} = \frac{X_A}{(r_A)} \)(c) \(\frac{V}{X_A} = \frac{(-r_A)}{F_{A_0}} \)(d) \(\frac{F_{A_0}}{V} = \frac{X_A}{-r_A} \)I had been asked this question in an interview.This intriguing question comes from Kinetics of Homogeneous Reactions in division Kinetics of Homogeneous Reactions of Chemical Reaction Engineering

Answer»

The CORRECT choice is (a) \(\FRAC{F_{A_0}}{V} = \frac{(-r_A)}{X_A} \)

Explanation: For a CSTR, Molar FLOW rate in = Molar flow rate out + accumulation

FA0 = FA + (-rA)V

FA0 = FA0(1- XA) + (-rA)V

Hence, FA0XA = (-rA)V.



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