Place the following in order of decreasing molar entropy at 298 K. HF N₂H₄ Ar

Question

Quizplus · Accepted Answer

Molar entropy increases with increasing molecular complexity and decreasing molar mass. N₂H₄ has multiple atoms and functional groups, and is the most complex molecule among the given options, so it has the highest molar entropy. HF is a smaller and simpler molecule than N₂H₄ and has fewer ways for its molecules to vibrate and rotate, so it has a lower molar entropy. Ar is a monoatomic molecule and has the lowest molar entropy due to its lack of molecular complexity and low molecular mass. Therefore, the correct order is: N₂H₄ > HF > Ar.

Place the Following in Order of Decreasing Molar Entropy at 298