Recall: The root mean square speed of a gas is given by:
where R = universal gas constant (8.314 J/mol K), T = temperature (in K), M = molar mass (in kg/mol). We can see that at a specific temperature, urms is inversely proportional to the molar mass: the higher the molar mass, the lower the urms will be.
How does the approximate root mean square velocity of neon compare to that of krypton at the same temperature?
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