Molecular Speeds: a Container Is Filled with a Mixture of Helium

question 9

Multiple Choice

Molecular speeds: A container is filled with a mixture of helium (light molecules) and oxygen (heavy molecules) gases. A thermometer in the container reads 22°C. Which gas molecules have the greater average kinetic energy?

• A) It is the same for both of the gases because the temperatures are the same.
• B) The oxygen molecules do because they are diatomic.
• C) The oxygen molecules do because they are more massive.
• D) The helium molecules do because they are less massive.
• E) The helium molecules do because they are monatomic.

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