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Question
Consider a mixture of oxygen and hydrogen kept at room temperature. As compared to a hydrogen molecule an oxygen molecule hits the wall
Options
with greater average speed
with smaller average speed
with greater average kinetic energy
with smaller average kinetic energy
Solution
with smaller average speed
The average speed of molecules is given by \[\sqrt{\frac{8kT}{\pi m}}\] .
We observe that greater the mass, lesser is the average speed of the molecule. Since an oxygen molecule is heavier than a hydrogen molecule, the oxygen molecule will hit the wall with smaller average speed.
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