of the liquid propane in the tank is $0\mathrm{.}621\frac{g}{m}L.(30$pt$)$

Many home barbeques are fueled with propane gas $(C_3{H}_8).$ What mass of carbon dioxide $($in $kg)$ forms upon the complete combustion of $18\mathrm{.}9L$ of propane $($approximate contents of one $5-$gallon tank$)?$ Assume that the density of the liquid propane in the tank is $0\mathrm{.}621\frac{g}{m}L.(30$pt$)$