Chapter 14: External Diffusion Effects on Heteregeneous Reactions
Derivation
Diffusion through stagnant gas

Stagnant gas WBz = 0
Rearranging

Concentration Profile
z = 0 yA = yA0
Diffusion through stagnant gas

Stagnant gas WBz = 0
Rearranging

z = 0 yA = yA0