Four liters of liquid n-heptanes and five liters of n-hexane are mixed and burned with the 4000 gram moles of air. Not all of the hydrocarbons are burned in the furnace, and both CO and CO2 are formed. If it is possible to do so without additional information, determine the percent excess air supplied to the furnace; if more information is needed, state what it is and draw the calculation of the percent excess air.