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How many degrees of freedom is there for a CO2 molecule with rotational kinetic energy?

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How many degrees of freedom is there for a CO2 molecule with rotational kinetic energy?

(a) 1

(b) 2

(c) 3

(d) 6

The question was asked in a national level competition.

The above asked question is from Microscopic Description of Gases in portion Properties of High Temperature Gases of Aerodynamics

1 Answer

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Best answer
The correct option is (b) 2

The best explanation: CO2 is a linear polyatomic molecule that has similar properties as the diatomic molecule having rotational kinetic energy. The moment of inertia for the molecule in z – axis is negligible small compared to x and y – axis. Due to this reason, diatomic and even linear polyatomic molecules have only two thermal degrees of freedom.

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