The average value of rotational kinetic energy of one mole of oxygen gas at temperature T will be
(A) RT
(B) 3/2 RT
(C) 5/2 RT
(D) 1/2 RT
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Correct option (A) RT
Explanation:
The degree of freedom of 1 mole of O2 gas is 5. Out of which 3 are translational and 2 are rotational. Now, the average kinetic energy is given as F/2 RT
where f is degree of freedom for rotational motion.
Therefore, the average kinetic energy is RT .