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Which of the following expressions correctly represents the relationship between the average molar kinetic energy, KE, of CO and N2 molecules at the same temperature?

1. KECO < KEN2
2. KECO > KEN2
3. KECO = KEN2
4. cannot be predicted unless volumes of the gases are given

Correct answer: KECO = KEN2

Solution

The average molar kinetic energy of gas molecules depends only on temperature and is independent of the type of gas. Since CO and N2 are at the same temperature, their average molar kinetic energies are equal.

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