To find the amount of oxygen required to react completely with 44.8 liters of carbon monoxide, you need to balance the chemical equation for the reaction.
The balanced chemical equation for the reaction between oxygen and carbon monoxide is:
2 CO + O2 -> 2 CO2
This equation shows that for every two molecules of CO and one molecule of O2 that react, two molecules of CO2 are produced.
Since the volume of a gas is directly proportional to the number of molecules it contains (at a constant temperature and pressure), we can say that 44.8 liters of CO will react with 44.8/2 = 22.4 liters of O2.
Therefore, to react completely with 44.8 liters of CO, you will need 22.4 liters of oxygen at standard conditions.