C6H14 > C6H12 > C6H6 Standard molar entropy has to do with the number of atoms that are present in each of the species. The greater the number of atoms possessed by the species, the higher the value of the standard molar entropy due to a greater number of vibration modes.
Keep in mind that while all solids are made of metals and that entropy reduces in the following order: gas, liquid, solid, molar entropy increases from top to bottom in a group as the size of the metal increases, so Ba > Ca > Mg.
Benzene (C6H6), cyclohexane (C6H14), and hexane (C6H12).
If all are liquid, the molar entropy falls as the compound's size rises.
Hexane comes before cyclohexane and benzene.
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