Discuss the Rate of Limit in Overall Reactions


The overall reaction
   A → B
proceeds via the following elementary steps

1) A + S ⇄ AS      r1 = k1 [ CACS– CAS/KA ]
2) AS ⇄ BS           r2= k2 [CAS – CBS/KS ]
3) BS ⇄ B + S      r3= k3 [CBS– CBCSKB ]

If CS = CStot/(1+kxCA + kxkyCA)
where kx and ky could either be kA, kS, or kB

Which step is rate limiting?

a) Step 1
b) Step 2
c) Step 3
d) Not enough info


The question belongs to Chemical Engineering and the question is about rate of limiting in overall reactions.

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