GJ$11$

B$.$ FA$+$B$+$C $+2$D C $3\mathrm{.}5$dm$3/$s $$ A $$ B $3\mathrm{.}257\mathrm{.}3$ mol$/$dm$30\mathrm{.}045($dm$3)52/$molt$/2.$s $110,000$ J$/$mol $180\backslash$deg C $$ A $($a$)$ A $140\backslash$deg C $250\backslash$deg C $60\%($b$)($PFR$)140\backslash$deg C $80\%$ PFR $$