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\sect{Chemical equilibrium: the law of mass action}

Write the law of mass action for the reaction ${H_{2}+D_{2} -->
2HD}$.
Determine the equilibrium constant ${K\left(T\right)}$ in terms of
the masses ${\mathsf{m}_{H}, \mathsf{m}_{D}}$ and ${\omega _{0}}$
the vibrational frequency of ${HD}$. Assume temperature is high
enough to allow classical approximation for the rotational motion.
Show that ${K\left(\infty\right) = 4}$.



