Q$2.$

The elementary gas phase reaction

$A+BC+D$

takes place isobarically and isothemally in a PFR where $50\%$ conversion is achieved. The feed is equimolar in A and B$.$ It is propesed to put a CSTR of equal voiume upstream, i$.$e$.,$

of the PFR$.$ What will be the intermedi.ts and exit conversions $x_1$ and $x_2$ respectively? The entering flow rates and all other variables remain the same as that for the single PFR$.$