The only difference between HBr and HCl is their mass. Due to its higher mass, HBr will have a higher entropy.
Entropy is a gauge of disorder, hence substances having greater molar values might be thought of as being more disorganized. The substance's condition has the most impact on the molar entropy. Compounds that are gases will have a far higher molar entropy than compounds that are liquids or solids because gases are much more widely dispersed. It is convenient to talk about a substance's entropy in terms of Sm°, or its standard molar entropy, because the entropy of a material depends on the amount of the substance, the pressure, and the temperature.
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