The composition of a natural gas is given below.CH$4=9\%$ ; C$2$H$4=76\%$ ; C$6$H$6=3\%$ ; H$2=5\%$ ; N$2=4\%$ This gas was combusted with $20\%$ excess air. The air is humid and contains $1\mathrm{.}5\%$ water vapor. $($Note: It will be assumed that N$2$ gas is not combusted.$)($C:$12,$ H:$1,$ O:$16,$ Air contains $21\%$ O$2$ by volume.$)$ a$)$ Find the theoretical amount of dry air required for the combustion of $1$ m$3$ of gas.b$)$ What is the amount of moist air used $($including excess air$)?$c$)$ What are the volumes of combustion product gases.