Consider a mixture of oxygen and hydrogen kept at room temperatur… - Vidyadip

MCQ

Consider a mixture of oxygen and hydrogen kept at room temperature. $AB$ compared to a hydrogen molecule an oxygen molecule hits the wall:

A
With greater average speed.
✓
With smaller average speed.
C
With greater average kinetic energy.
D
With smaller average kinetic energy.

✓

Answer

Correct option: B.

With smaller average speed.

The average speed of molecules is given by $\sqrt{\frac{8\text{kT}}{\pi\text{m}}}.$
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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