A catalytic converter in a car uses a platinum catalyst to convert CO (g) to CO2 (g). The reaction: 2CO (g) + O2 (g) 2CO2 (g) A graduate student researching the effectiveness of a new catalyst combines a 2:1 mole ratio mixture of carbon monoxide and oxygen gas (respectively) over the catalyst in a 2.50-L flask at a total pressure of 750 torr and a temperature of 560 C. When the reaction is complete, the pressure in the flask has dropped to 550 torr. What percentage of the CO (g) was converted to CO2 (g)?