Ethylbenzene $($EB$)$ dehydrogenation to styrene is carried out in gas phase under isothermal$-$

isobaric conditions in a flow equipment in the presence of steam $($inert$)$

$C_8{H}_{10}{C}_8{H}_8+H_2$

Inlet mixture contains $20\%($molar$)$ of EB and $80\%$ of steam. Determine the conversion of

EB if the outlet molar fraction of EB is $0\mathrm{.}035.$