At 298 K, calculate the root mean square velocity and kinetic energy of CO, CO₂, and SeO₃. Which gas has the greatest velocity? The greatest kinetic energy? The greatest effusion rate?

• A. SeO₃ has the greatest velocity and effusion rate, while CO₂ has the greatest kinetic energy.
• B. SeO₃ has the greatest velocity and kinetic energy, while CO has the greatest effusion rate.
• C. CO has the greatest velocity and effusion rate, while the kinetic energy is the same for all.
• D. CO has the greatest velocity, the kinetic energy is the same for all, and CO₂ has the greatest effusion rate.

Answer: (C)