At $1\mathrm{.}00$atm and $0C,$ a $5\mathrm{.}04L$ mixture of methane $(C{H}_4)$ and propane $(C_3{H}_8)$ was burned, producing $18\mathrm{.}7gC{O}_2.$ What was

the mole fraction of each gas in the mixture? Assume complete combustion.

$x_{\text{m}\text{e}\text{t}\text{h}\text{a}\text{n}\text{e}}=$

x propane$=$