Question

Rank the following chemical species from lowest absolute entropy (So) to highest absolute entropy at 298 K?

1) N₂H₄ (l)
2) H₂O (l)
3) CH₃COOH (l)
4) BaO (s)
5) HCN (g)

Answer 1

The chemical species can be ranked from lowest to highest absolute entropy at 298 K.

Step-by-step explanation:

The absolute entropy of a substance depends on its physical state and molecular complexity. In general, gases have higher entropy than liquids, and liquids have higher entropy than solids. Additionally, larger and more complex molecules tend to have higher entropy than smaller molecules.

Ranking the given chemical species from lowest to highest absolute entropy at 298 K:

BaO (s) - This is a solid and has the lowest absolute entropy.

N₂H₄ (l) - This is a liquid and has higher entropy than a solid.

CH₃COOH (l) - This is also a liquid and has higher entropy than N₂H₄.

H₂O (l) - Water is a liquid and has higher entropy than CH₃COOH.

HCN (g) - HCN is a gas and has the highest absolute entropy among the given substances.