Question

How does the standard entropy of a substance depend on its molar mass?

1. The standard entropy of a substance does not depend on its molar mass.
2. The larger the molar mass, the greater the entropy.
3. The larger the molar mass, the lower the entropy.

Answer 1

Entropy is a thermodynamic function that increases with the number of energetically ways to arrange the components of a system to achieve a particular state. The entropy of a state increases with the number of energetically ways to arrange the components of the system to achieve that particular state. The entropy of a system increases, if the number of molecules increases. Thus, the entropy increases if the molar mass increases. Therefore, the correct answer is option 2 The larger the molar mass, the greater the entropy.