What volume of carbon dioxide is produced if 8.68 L of oxygen is consumed during the combustion of the ethanol in the car's engine? Assume constant temperature and pressure.

Question

C₂H₅OH(G)+3O₂(g)=2CO₂(g)+3H₂O(g)

Answer 1

C₂H₅OH(G)+3O₂(g)=2CO₂(g)+3H₂O(g)

From this balanced equation we see that the amount of CO2 produced is 2/3 the amount of O2 consumed. At constant temperature and pressure, we can equate liters and moles so we can say that for every 3 moles or liters of O2 consumed we will produce 2 moles or liters of CO2.

8.68 L O2 x 2 L CO2 / 3 L O2 = 5.79 L CO2