Many home barbeques are fueled with propane gas ({rm{C}}_3 {rm{H}}_8 ).
What mass of carbon dioxide (in {rm kg}) is produced upon the complete combustion of 18.9 {rm L} of propane (approximate contents of one 5-gallon tank)? Assume that the density of the liquid propane in the tank is 0.621 {rm g}/{rm mL}. (Hint: Begin by writing a balanced equation for the combustion reaction.)