The molar mass of the molecule can be used to illustrate the molecular complexity effect. Since CH₃OCH₃(l) has a molar mass that is double that of CH₃CH₂OH(l), it has more energy microstates and a greater entropy.
The atomic radius and molar mass grow as one moves down the group, bringing the energy levels closer together as a result. As a result, as one moves down the group, both the number of energy microstates and the molar entropy rise. The difference between the sum of the molar entropies of the products and the sum of the molar entropies of the reactants can be used to determine the change in the standard molar entropy of a reaction.
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