Xenons at the same temperature, will effuse the slowest
The effusion rates is said to be inversely proportional to the square root of the molecular masses of the gases.
At a set temperature, the average kinetic energy of all gaseous molecules is always equal.
Hydrogen gas has the lowest mass out of these gases, it will have the highest average velocity and as such, that it will exit out of the tiny hole at a rate faster than the other gases.
Conclusively, The rate of effusion for a gas is inversely proportional to the square-root of its molecular mass, this is Graham's Law.
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