Natural gas $($mostly CHA and some HaS$)$ is burned in a furnace using excess dry air. The dry exhaust gas composition is CO$2-11\%$V$/$V$,$ O$2-10\%$V$/$V$,$ Na$-76\%$v$/$v$,$ SO$2-3\%$v$/$v$.$The mole fraction of water in the wet exhaust is $0\mathrm{.}05$ c$)$Calculate in weight $\%$ and molar $\%$ the composition of:

$($i$)$the wet exhaust

ii$)$the natural gas feed

$($d$)$Calculate the percent excess air used.

$($e$)$Based on feed of $500$ kmol CHA h$1$ determine the molar rate of air used in

combustion.

f$)$One of the concerns is the amount of SO$2$ in the exhaust. To reduce it$,$ half of the

exhaust is recycled back to the furnace. Comment on the rate and SO$2$ content of

the exhaust to the atmosphere.

$($g$)$What modification of the process would you suggest as more appropriate than the one$$in $($f$)?$