Sharing energy by equipartition

You will write three functions that count degrees of freedom and share out the energy.

The idea. Each squared term in the energy of a molecule gets $\tfrac12 k_BT$. Moving gives 3 terms, turning gives 2 or 3, and each vibration gives 2. Then $E = \tfrac{f}{2}k_BT$ for one molecule and $U = \tfrac{f}{2}nRT$ for the gas.

Your tasks.

1. In degrees, return $f$ from the number of ways to turn and the number of vibrations.
2. In energy_one, return the average energy of one molecule, in J.
3. In energy_gas, return the internal energy of $n$ moles, in J.