Gaseous ethane $(C{H}_{3}C{H}_3)$ will react with gaseous oxygen $(O_2)$ to produce gaseous carbon dioxide $(C{O}_2)$ and gaseous water $(H_{2}O).$ Su is mixed with $17\mathrm{.}5g$ of oxygen. Calculate the minimum mass of ethane that could be left over by the chemical reaction. Round your answer digits.