As a molecule's structure gets more complex, entropy __________.

As a molecule's structure gets more complex, entropy __________.

• A. Increases
• B. Decreases
• C. Stays the same
• D. Cannot be determined

Answer: (A)

Entropy is a measure of how many microstates a system can occupy, essentially how freely energy can be distributed among its parts. When a molecule becomes more complex, you gain more atoms, more bonds, and more possible motions—extra rotatable bonds, more vibrational modes, and more conformations. Each additional degree of freedom increases the number of ways energy and particles can be arranged at a given temperature, so the number of accessible microstates goes up. With more accessible microstates, the entropy rises. So, as structure becomes more complex, entropy increases.

Entropy is a measure of how many microstates a system can occupy, essentially how freely energy can be distributed among its parts. When a molecule becomes more complex, you gain more atoms, more bonds, and more possible motions—extra rotatable bonds, more vibrational modes, and more conformations. Each additional degree of freedom increases the number of ways energy and particles can be arranged at a given temperature, so the number of accessible microstates goes up. With more accessible microstates, the entropy rises. So, as structure becomes more complex, entropy increases.