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Find the moment of inertia and the energy (in kJ/mol) of a nitrogen molecule N2

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camariela:
Hello,
I'm confused about the formulas to use and combine to find the moment of inertia and the energy (in kJ/mol) of a nitrogen molecule (N2) in its first excited rotational state.

Thanks
camariela

Mitch:
What's the equation for moment of inertia?

camariela:
I = mr^2

i have the mass, but what do i use for r?

Mitch:
The radius of a Nitrogen atom I suppose.

Borek:
I would rather go for half a triple bond length (or even better for half a N2 length). Atomic radius is for free atom and is of no use here.

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