Determine concentration for each species $($including inert$)$ in the final products for the following reaction in a gas flow PFR system: $2C_2{H}_6+7O_{2}4C{O}_2+6H_{2}O(g)$

$20\%$ ethane is mixed with $80\%$ air before entering the reactor. Limiting reactant conversion is $34\%.$ The system is operated at constant temperature $(300K)$ and constant pressure $(1$atm$).$ Assume gas is ideal gas.