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The entropy would be different based on the different phases. This can be understood mathematically as at various temperatures, the phase would change for the substance, causing a change in entropy due to the change in the temperature.
The standard entropy of a substance increases with an increase in the molar mass. But I also think that the standard entropy of a gas at STP takes in a lot of factors of phase change and heat capacities of solids and liquids as well.
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