Question: Part 1: Below about 80 K the heat capacity at constant volume for hydrogen gas (H2) is 3/2k per molecule, but at higher temperatures the heat capacity increases to 5/2k per molecule due to contributions from rotational energy states. Use these observations to estimate the distance between the hydrogen nuclei in an H2 molecule. Part 2: At about 2000K, the specific heat at constant volume for hydrogen gas (H2) increases to 7/2k per molecule due to contributions from vibrational energy states. Use the observations to estimate the stiffness of the spring that approximately represents the interatomic force. If you guys could give hints/help at all that'd be awesome. I'm looking for a start point or anything that may lead me to solving this. Thanks!