Boltzmann Equation for Entropy:
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Molecules/atoms with higher mass have more entropy because they have more subatomic particles, which can occupy more microstates within the molecule/atom's electron clouds and nuclei. There are definitely more formal and correct explanations as to why molecules that are larger and more complex have higher entropy, but those explanations are usually beyond the scope of a freshman chemistry course and the relatively simple explanation that I provided should suffice.
it is because more mass = more electrons. electrons have so many possible states, so when there are more electrons there are even more possible states. so basically entropy has to do with not only the arrangement of atoms, but also their subatomic particles.
The standard entropy of a substance increases with an increase in the molar mass. This is because with the increase in molar mass the energy states of the atoms are more closely spaced to each other. Due to more closely spacing between the energy states, there is greater dispersal of energy at the given temperature which leads to an increase in entropy.
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