Molar mass is greater in CuSO45H2O(s). Pentahydrate copper salt has a higher molar entropy because there are more energy microstates present.
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. A substance's entropy rises as its molecular weight, complexity, and temperature rise. As the pressure or concentration decreases, the entropy likewise rises. Gas entropies are significantly higher than those of condensed phases. Compared to solids or liquids, gases have higher entropies because of their chaotic mobility. That implies that entropy will alter during a reaction in which the quantity of gas molecules present changes.
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