Molar entropy

[Evelyn-Marian Barber]

How do we calculate what compound will have a higher molar entropy? For example, if it is between HBr and HF, how do we know which one has a higher molar entropy?

[Adam Jameel 2A]

typically as molar mass increases, molar entropy increases so in this instance, HBr being heavier than HF, typically has a higher molar entropy.

[Harry Forbeck 2A]

Also, another big factor in molar entropy is the complexity of the molecule, so if you have something like H vs HF, then HF would have the higher molar entropy because it is a more complex molecule.

[Sydney Nguyen 1K]

The entropy of a substance increases with its molecular weight and complexity, and with temperature. The entropy also increases as the pressure or concentration becomes smaller. Entropies of gases are much larger than those of condensed phases. In this case, the molecular weight of HBr is 80.91 g/mol and the molecular weight of HF is 20.01 g/mol. Thus, 1 mole of HBr has greater entropy.

[Jessica Gebraeel 1A]

The entropy of molecules with a heavier molecular weight is larger! Molar entropy also tends to increase with a decrease in pressure (which can be caused by a decrease of concentration). In your question, the answer should just be the one with a larger mass!

[suhas yarra 2D]

You cannot always calculate, but predict based on factors: Molecular weight, complexity, and temperature. As these three factors increase so does the entropy. Additionally, phases matter (gas has higher entropy than liquid, then solid).

[BeauBrown]

Entropy is disorder, and the heavier the molecule the less order, meaning a higher molar mass is a higher S