The following first$-$order liquid phase reaction is carried out in an isothermal PFR as follows:

A$->$ B

K$=0\mathrm{.}5$ min$-$

If $95\%$ of A is converted to B in thePFR;

a$)$ Determine the minimum number of identical CSTRs in series $($with the same total volume as the original PFR$)$ required to get within $95\%$ of this conversion?

b$)$ Determine the minimum number of identical CSTRs in series $($with the same total volume as the. original PFR$)$ required to get within $99\%$ of this conversion?

c$)$ Does this make sense?Why are the answers to $($a$)$ and $($b$)$ so different?