Question

A molecule of sulphur dioxide is 4 times heavier than an atom of oxygen gas. The average kinetic energy of an oxygen molecule at 298$K$ is:

• A. one fourth of $S{O}_2$ molecule
• B. same as that of $S{O}_2$ molecule
• C. half of that of $S{O}_2$ molecule
• D. four times that of $S{O}_2$ molecule

Answer 1

The correct option is B same as that of $S{O}_2$ molecule

One of the postulates of kinetic theory of gases states that all gases at a given temperature have the same average kinetic energy.
So, the average kinetic energy of an oxygen molecule at 298$K$ is same as that of $S{O}_2$ molecule.