Question

For Instantaneous reaction with high concentration of liquid, the correct rate expression is ____

(a) kAgpA = -rA

(b) kAgpAkAl = -rA

(c) \(\frac{k_{Ag} p_A}{k_{Al}}\) = -rA

(d) pAkAl = -rA

The question was asked in an interview for internship.

This question is from Design of Fluid Fluid Reactors topic in portion Fluid-Fluid Reactions: Kinetics & Basics of Non Ideal Flow of Chemical Reaction Engineering

Answer 1

Correct option is (a) kAgpA = -rA

To explain I would say: The concentration of liquid is high. The gas phase resistance controls and hence the overall rate is determined by diffusion of A through gas film.