**Question:****At low temperatures (T<< Θ _{r} ) the rotational partition functions for ortho- and para-H_{2} molecules are **

**q _{r,ortho} = 3e^{−2Θr/T} + 7e^{−12Θr/T} (1)**

**q _{r,para} = 1 + 5e^{−6Θr/T} (2)**

**and for equilibrium hydrogen**

**q _{r} = 1 + 9e^{−2Θr/T} (3)**

**Calculate the rotational contributions to the heat capacities of normal hydrogen (3:1 mixture of ortho and para) and of equilibrium hydrogen in the limit of low temperatures. What is larger?**

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