Look in your text and/or notes to see why real gases are not ideal. Specifically look at the volume occupied by the gas molecules as well as the attraction between molecules of the gas.
For the second part, remember that the rate of diffusion is proportional (inversely, I believe) with the square root of the molar mass. What is the molar mass of CO? of N2?
Use the kinetic theory of gases to explain this statement: No gas exhibits ideal behavior at all temperatures and pressures.
Explain why the rates of diffusion of nitrogen gas and carbon monoxide are almost identical at the same temperature.
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