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Question- The average kinetic energy of the molecules in a gas sample depends only on the temperature, T. But given the same kinetic energies, a lighter molecule will move faster than a heavier molecule. Where R=8.314 J/(mol•K) and ? is molar mass in kilograms per mole. Note that a joule is the same as a kg•m2/s2. What is the rms speed of O2 molecules at 357 K? What is the rms speed of He atoms at 357 K?

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