A 285 mL flask contains a mixture of CO, CO₂, and O₂ at 15°C. What is the partial pressure of O₂ if the total pressure is 795 torr, the CO has a partial pressure of 265 torr and the CO₂ has a partial pressure of 355 torr?

• A. 445 torr
• B. 180 torr
• C. 145 torr
• D. 175 torr
• E. 530 torr

Answer: (D)