What volume oxygen is required so that 630 mm of carbon monoxide that is completely converted to carbon dioxide?

To determine the volume of oxygen required for the complete combustion of carbon monoxide (CO) to carbon dioxide (CO₂), we use the balanced chemical equation: 2 CO + O₂ → 2 CO₂. This indicates that 1 volume of O₂ is needed for every 2 volumes of CO. Therefore, for 630 mm of CO, the volume of oxygen required would be 315 mm.